TY  - JOUR
AU  - Knežević, Stevan Z.
AU  - Elezović, Igor
AU  - Datta, Avishek
AU  - Vrbničanin, Sava
AU  - Glamočlija, Đorđe
AU  - Simić, Milena
AU  - Malidza, Goran
PY  - 2013
UR  - http://rik.mrizp.rs/handle/123456789/506
AB  - The critical time for weed removal (CTWR) is a period in the crop growth cycle when weed control must be initiated to prevent yield losses. Knowing the CTWR is useful for making decisions about the timing of weed control and in achieving efficient herbicide use from both biological and economic perspectives. Field studies were conducted in 2008 and 2009 at three locations in Serbia and one location in the USA to determine the CTWR in imidazolinone (IMI)-resistant sunflower grown with and without application of pre-emergence (PRE) herbicide. A four-parameter log-logistic model was fitted to data relating relative crop yield to increasing duration of weed presence. The CTWR without PRE herbicide treatment ranged from 14 to 26d after emergence (DAE) corresponding to the V3 (three leaves) to V4 stages compared to 25 to 37 DAE, which corresponded to the V6 to V8 stages with PRE herbicide. The CTWR in IMI-resistant sunflower grown with PRE herbicide can be delayed by an additional 6 to 12 d compared to the crop grown without PRE herbicide under the present experimental conditions. The practical implication of this study is that the use of PRE herbicide could extend post-herbicide treatments by another 6 to 12d with respect to the critical time required for weed removal without PRE herbicide in IMI-resistant sunflower.
PB  - Taylor & Francis Ltd, Abingdon
T2  - International Journal of Pest Management
T1  - Delay in the critical time for weed removal in imidazolinone-resistant sunflower (Helianthus annuus) caused by application of pre-emergence herbicide
VL  - 59
IS  - 3
SP  - 229
EP  - 235
DO  - 10.1080/09670874.2013.830797
ER  - 

@article{
author = "Knežević, Stevan Z. and Elezović, Igor and Datta, Avishek and Vrbničanin, Sava and Glamočlija, Đorđe and Simić, Milena and Malidza, Goran",
year = "2013",
abstract = "The critical time for weed removal (CTWR) is a period in the crop growth cycle when weed control must be initiated to prevent yield losses. Knowing the CTWR is useful for making decisions about the timing of weed control and in achieving efficient herbicide use from both biological and economic perspectives. Field studies were conducted in 2008 and 2009 at three locations in Serbia and one location in the USA to determine the CTWR in imidazolinone (IMI)-resistant sunflower grown with and without application of pre-emergence (PRE) herbicide. A four-parameter log-logistic model was fitted to data relating relative crop yield to increasing duration of weed presence. The CTWR without PRE herbicide treatment ranged from 14 to 26d after emergence (DAE) corresponding to the V3 (three leaves) to V4 stages compared to 25 to 37 DAE, which corresponded to the V6 to V8 stages with PRE herbicide. The CTWR in IMI-resistant sunflower grown with PRE herbicide can be delayed by an additional 6 to 12 d compared to the crop grown without PRE herbicide under the present experimental conditions. The practical implication of this study is that the use of PRE herbicide could extend post-herbicide treatments by another 6 to 12d with respect to the critical time required for weed removal without PRE herbicide in IMI-resistant sunflower.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "International Journal of Pest Management",
title = "Delay in the critical time for weed removal in imidazolinone-resistant sunflower (Helianthus annuus) caused by application of pre-emergence herbicide",
volume = "59",
number = "3",
pages = "229-235",
doi = "10.1080/09670874.2013.830797"
}

Knežević, S. Z., Elezović, I., Datta, A., Vrbničanin, S., Glamočlija, Đ., Simić, M.,& Malidza, G.. (2013). Delay in the critical time for weed removal in imidazolinone-resistant sunflower (Helianthus annuus) caused by application of pre-emergence herbicide. in International Journal of Pest Management
Taylor & Francis Ltd, Abingdon., 59(3), 229-235.
https://doi.org/10.1080/09670874.2013.830797

Knežević SZ, Elezović I, Datta A, Vrbničanin S, Glamočlija Đ, Simić M, Malidza G. Delay in the critical time for weed removal in imidazolinone-resistant sunflower (Helianthus annuus) caused by application of pre-emergence herbicide. in International Journal of Pest Management. 2013;59(3):229-235.
doi:10.1080/09670874.2013.830797 .

Knežević, Stevan Z., Elezović, Igor, Datta, Avishek, Vrbničanin, Sava, Glamočlija, Đorđe, Simić, Milena, Malidza, Goran, "Delay in the critical time for weed removal in imidazolinone-resistant sunflower (Helianthus annuus) caused by application of pre-emergence herbicide" in International Journal of Pest Management, 59, no. 3 (2013):229-235,
https://doi.org/10.1080/09670874.2013.830797 . .

TY  - JOUR
AU  - Elezović, Igor
AU  - Datta, Avishek
AU  - Vrbničanin, Sava
AU  - Glamočlija, Đorđe
AU  - Simić, Milena
AU  - Malidza, Goran
AU  - Knežević, Stevan Z.
PY  - 2012
UR  - http://rik.mrizp.rs/handle/123456789/419
AB  - With an increase in the use of imidazolinone (IMI)-resistant sunflower, it is important to determine the influence of weed interference and herbicide presence on seed yield and yield components of sunflower. The objective of this study was to determine the effect of different periods of weed presence on seed yield and yield components of IMI-resistant sunflower grown with and without ore-emergence (PRE) herbicide. Field studies were conducted in 2008 and 2009 at three locations in Serbia and one location in Nebraska, USA. A four-parameter log-logistic model described relationship between the crop yield and yield components to increasing duration of weed presence. Sunflower yield and yield components varied between years and among locations. Increasing periods of weed interference decreased yield and yield components of sunflower; however, the reductions were greater without PRE herbicide compared to the PRE herbicide treated plots. The length of time weeds could remain in the crop grown without PRE herbicide ranged from 14 to 26 days after emergence (DAE), which corresponded to the V3 (three leaves) to V4 growth stages on the basis of the 5% acceptable yield loss level. The duration of time that weeds could remain in the crop grown with PRE herbicide ranged from 25 to 37 DAE, which corresponded to the V6-V8 growth stages of sunflower. Practical implication of this study is that post-emergence weed control in IMI-resistant sunflower grown with PRE herbicide can be delayed approximately by two weeks compared to the crop grown without PRE herbicide.
PB  - Elsevier Science Bv, Amsterdam
T2  - Field Crops Research
T1  - Yield and yield components of imidazolinone-resistant sunflower (Helianthus annuus L.) are influenced by pre-emergence herbicide and time of post-emergence weed removal
VL  - 128
SP  - 137
EP  - 146
EP  - 
DO  - 10.1016/j.fcr.2011.12.020
ER  - 

@article{
author = "Elezović, Igor and Datta, Avishek and Vrbničanin, Sava and Glamočlija, Đorđe and Simić, Milena and Malidza, Goran and Knežević, Stevan Z.",
year = "2012",
abstract = "With an increase in the use of imidazolinone (IMI)-resistant sunflower, it is important to determine the influence of weed interference and herbicide presence on seed yield and yield components of sunflower. The objective of this study was to determine the effect of different periods of weed presence on seed yield and yield components of IMI-resistant sunflower grown with and without ore-emergence (PRE) herbicide. Field studies were conducted in 2008 and 2009 at three locations in Serbia and one location in Nebraska, USA. A four-parameter log-logistic model described relationship between the crop yield and yield components to increasing duration of weed presence. Sunflower yield and yield components varied between years and among locations. Increasing periods of weed interference decreased yield and yield components of sunflower; however, the reductions were greater without PRE herbicide compared to the PRE herbicide treated plots. The length of time weeds could remain in the crop grown without PRE herbicide ranged from 14 to 26 days after emergence (DAE), which corresponded to the V3 (three leaves) to V4 growth stages on the basis of the 5% acceptable yield loss level. The duration of time that weeds could remain in the crop grown with PRE herbicide ranged from 25 to 37 DAE, which corresponded to the V6-V8 growth stages of sunflower. Practical implication of this study is that post-emergence weed control in IMI-resistant sunflower grown with PRE herbicide can be delayed approximately by two weeks compared to the crop grown without PRE herbicide.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Field Crops Research",
title = "Yield and yield components of imidazolinone-resistant sunflower (Helianthus annuus L.) are influenced by pre-emergence herbicide and time of post-emergence weed removal",
volume = "128",
pages = "137-146-",
doi = "10.1016/j.fcr.2011.12.020"
}

Elezović, I., Datta, A., Vrbničanin, S., Glamočlija, Đ., Simić, M., Malidza, G.,& Knežević, S. Z.. (2012). Yield and yield components of imidazolinone-resistant sunflower (Helianthus annuus L.) are influenced by pre-emergence herbicide and time of post-emergence weed removal. in Field Crops Research
Elsevier Science Bv, Amsterdam., 128, 137-146.
https://doi.org/10.1016/j.fcr.2011.12.020

Elezović I, Datta A, Vrbničanin S, Glamočlija Đ, Simić M, Malidza G, Knežević SZ. Yield and yield components of imidazolinone-resistant sunflower (Helianthus annuus L.) are influenced by pre-emergence herbicide and time of post-emergence weed removal. in Field Crops Research. 2012;128:137-146.
doi:10.1016/j.fcr.2011.12.020 .

Elezović, Igor, Datta, Avishek, Vrbničanin, Sava, Glamočlija, Đorđe, Simić, Milena, Malidza, Goran, Knežević, Stevan Z., "Yield and yield components of imidazolinone-resistant sunflower (Helianthus annuus L.) are influenced by pre-emergence herbicide and time of post-emergence weed removal" in Field Crops Research, 128 (2012):137-146,
https://doi.org/10.1016/j.fcr.2011.12.020 . .

TY  - JOUR
AU  - Simić, Milena
AU  - Dragičević, Vesna
AU  - Knežević, Stevan Z.
AU  - Radosavljević, Milica
AU  - Dolijanović, Željko
AU  - Filipović, Milomir
PY  - 2011
UR  - http://rik.mrizp.rs/handle/123456789/382
AB  - The level of weed infestation directly affects the intensity of competitive relationship between sunflower crops and weeds. The greatest damage is caused by annual, broad-leaf and invasive weeds, such as Ambrosia artemisiifolia L., Xanthium strumarium L. and Datura stramonium L. Suppression of these weeds is difficult because of deficiency of adequate herbicides and because in years with dry springs, such as in 2009, the use of herbicides gives no results. This two-year study dealt with the observed effects of pre-emergence flurochloridone + s-metolachlor herbicides on the distribution of weeds in different stages of sunflower development. Weed infestation was estimated over the sunflower developmental stages, i.e., in the periods when weeds were removed and when the total fresh and dry biomass of the weed species was determined. Simultaneously, in order to monitor the effects of weeds in dependence on herbicides application and the duration of competition, the sunflower plant height was measured. At the end of the life cycle, the yield and the oil content of the sunflower seeds were established. The total fresh weed biomass changed in dependence on the sunflower developmental stages and was always lower on the herbicide-treated area. This affected the sunflower plant height, yield and the oil content, which were higher, on the average, in the variants with herbicide applications (70.4 cm, 2959.7 kg ha-1 and 42.0%) than in the variants without herbicides application (57.4 cm, 2711.1 kg ha-1 and 40.1%). Weed suppression in the sunflower crop has to be done with adequate herbicides and in due time in order to suppress a significant reduction in morphological and yield parameters.
PB  - Institut za ratarstvo i povrtarstvo, Novi Sad
T2  - Helia
T1  - Effects of applied herbicides on crop productivity and on weed infestation in different growth stages of sunflower (Helianthus annuus L.)
VL  - 34
IS  - 54
SP  - 27
EP  - 37
DO  - 10.2298/HEL1154027S
ER  - 

@article{
author = "Simić, Milena and Dragičević, Vesna and Knežević, Stevan Z. and Radosavljević, Milica and Dolijanović, Željko and Filipović, Milomir",
year = "2011",
abstract = "The level of weed infestation directly affects the intensity of competitive relationship between sunflower crops and weeds. The greatest damage is caused by annual, broad-leaf and invasive weeds, such as Ambrosia artemisiifolia L., Xanthium strumarium L. and Datura stramonium L. Suppression of these weeds is difficult because of deficiency of adequate herbicides and because in years with dry springs, such as in 2009, the use of herbicides gives no results. This two-year study dealt with the observed effects of pre-emergence flurochloridone + s-metolachlor herbicides on the distribution of weeds in different stages of sunflower development. Weed infestation was estimated over the sunflower developmental stages, i.e., in the periods when weeds were removed and when the total fresh and dry biomass of the weed species was determined. Simultaneously, in order to monitor the effects of weeds in dependence on herbicides application and the duration of competition, the sunflower plant height was measured. At the end of the life cycle, the yield and the oil content of the sunflower seeds were established. The total fresh weed biomass changed in dependence on the sunflower developmental stages and was always lower on the herbicide-treated area. This affected the sunflower plant height, yield and the oil content, which were higher, on the average, in the variants with herbicide applications (70.4 cm, 2959.7 kg ha-1 and 42.0%) than in the variants without herbicides application (57.4 cm, 2711.1 kg ha-1 and 40.1%). Weed suppression in the sunflower crop has to be done with adequate herbicides and in due time in order to suppress a significant reduction in morphological and yield parameters.",
publisher = "Institut za ratarstvo i povrtarstvo, Novi Sad",
journal = "Helia",
title = "Effects of applied herbicides on crop productivity and on weed infestation in different growth stages of sunflower (Helianthus annuus L.)",
volume = "34",
number = "54",
pages = "27-37",
doi = "10.2298/HEL1154027S"
}

Simić, M., Dragičević, V., Knežević, S. Z., Radosavljević, M., Dolijanović, Ž.,& Filipović, M.. (2011). Effects of applied herbicides on crop productivity and on weed infestation in different growth stages of sunflower (Helianthus annuus L.). in Helia
Institut za ratarstvo i povrtarstvo, Novi Sad., 34(54), 27-37.
https://doi.org/10.2298/HEL1154027S

Simić M, Dragičević V, Knežević SZ, Radosavljević M, Dolijanović Ž, Filipović M. Effects of applied herbicides on crop productivity and on weed infestation in different growth stages of sunflower (Helianthus annuus L.). in Helia. 2011;34(54):27-37.
doi:10.2298/HEL1154027S .

Simić, Milena, Dragičević, Vesna, Knežević, Stevan Z., Radosavljević, Milica, Dolijanović, Željko, Filipović, Milomir, "Effects of applied herbicides on crop productivity and on weed infestation in different growth stages of sunflower (Helianthus annuus L.)" in Helia, 34, no. 54 (2011):27-37,
https://doi.org/10.2298/HEL1154027S . .

TY  - JOUR
AU  - Bača, Franja
AU  - Gošić-Dondo, Snežana
AU  - Kaitović, Željko
AU  - Videnović, Živorad
AU  - Kresović, Branka
AU  - Knežević, Stevan Z.
PY  - 2008
UR  - http://rik.mrizp.rs/handle/123456789/244
AB  - Proper planting date is important for maize production. Therefore, field studies were conducted from 1995-2005 to determine the most suitable planting date for six maize hybrids (FAO 300-700 maturity groups) as influenced by infestation level of European corn borer (ECB), Ostrinia nubilalis (Hbn). Significant differences in the levels of ECB infestation, level of damage and grain yield were observed between the planting dates, and the years. The total plant infestation by both generations ECB over the planting dates ranged from 47% to 60%. Plant damage rating was on the average of 2.2 and slightly differed across the planting dates. Yield results indicated that the planting period for maize production in the Vojvodina province was from April 15 to May 5, but the Most Suitable date was the beginning of the third week of April.
PB  - Maydica-Ist Sper Cerealicoltur, Bergamo
T2  - Maydica
T1  - Effect of planting dates on the level of European corn borer (Ostrinia nubilalis hbn.) Infestation, and crop injury and grain yield of maize (Zea mays l.)
VL  - 53
IS  - 2
SP  - 111
EP  - 115
UR  - https://hdl.handle.net/21.15107/rcub_rik_244
ER  - 

@article{
author = "Bača, Franja and Gošić-Dondo, Snežana and Kaitović, Željko and Videnović, Živorad and Kresović, Branka and Knežević, Stevan Z.",
year = "2008",
abstract = "Proper planting date is important for maize production. Therefore, field studies were conducted from 1995-2005 to determine the most suitable planting date for six maize hybrids (FAO 300-700 maturity groups) as influenced by infestation level of European corn borer (ECB), Ostrinia nubilalis (Hbn). Significant differences in the levels of ECB infestation, level of damage and grain yield were observed between the planting dates, and the years. The total plant infestation by both generations ECB over the planting dates ranged from 47% to 60%. Plant damage rating was on the average of 2.2 and slightly differed across the planting dates. Yield results indicated that the planting period for maize production in the Vojvodina province was from April 15 to May 5, but the Most Suitable date was the beginning of the third week of April.",
publisher = "Maydica-Ist Sper Cerealicoltur, Bergamo",
journal = "Maydica",
title = "Effect of planting dates on the level of European corn borer (Ostrinia nubilalis hbn.) Infestation, and crop injury and grain yield of maize (Zea mays l.)",
volume = "53",
number = "2",
pages = "111-115",
url = "https://hdl.handle.net/21.15107/rcub_rik_244"
}

Bača, F., Gošić-Dondo, S., Kaitović, Ž., Videnović, Ž., Kresović, B.,& Knežević, S. Z.. (2008). Effect of planting dates on the level of European corn borer (Ostrinia nubilalis hbn.) Infestation, and crop injury and grain yield of maize (Zea mays l.). in Maydica
Maydica-Ist Sper Cerealicoltur, Bergamo., 53(2), 111-115.
https://hdl.handle.net/21.15107/rcub_rik_244

Bača F, Gošić-Dondo S, Kaitović Ž, Videnović Ž, Kresović B, Knežević SZ. Effect of planting dates on the level of European corn borer (Ostrinia nubilalis hbn.) Infestation, and crop injury and grain yield of maize (Zea mays l.). in Maydica. 2008;53(2):111-115.
https://hdl.handle.net/21.15107/rcub_rik_244 .

Bača, Franja, Gošić-Dondo, Snežana, Kaitović, Željko, Videnović, Živorad, Kresović, Branka, Knežević, Stevan Z., "Effect of planting dates on the level of European corn borer (Ostrinia nubilalis hbn.) Infestation, and crop injury and grain yield of maize (Zea mays l.)" in Maydica, 53, no. 2 (2008):111-115,
https://hdl.handle.net/21.15107/rcub_rik_244 .

TY  - JOUR
AU  - Knežević, Stevan Z.
AU  - Bača, Franja
AU  - Lević, Jelena
AU  - Stanković, Slavica
AU  - Stefanović, Lidija
AU  - Simić, Milena
AU  - Gošić-Dondo, Snežana
PY  - 2007
UR  - http://rik.mrizp.rs/handle/123456789/169
AB  - Changes in pest populations occur on a regular basis and can be influenced by various biotic and abiotic factors, including human activites. The objective of this article was to outline several factors that contributed to the population changes in major maize pests over a 50 year period as reported in Serbian literature. Populations of economically important insects, pathogens and weeds were influenced by changes in agronomic practices and introduction of new species. Examples of new pests included: insect species such as western corn rootworm, weed species such as common ragweed and marshelder, and various pathogens including races of Exserohilum turcicum and Bipolaris zeicola. There was also an increase in maize dwarf mosaic virus and barley yellow dwarf virus.
PB  - Maydica-Ist Sper Cerealicoltur, Bergamo
T2  - Maydica
T1  - Factors contributing to the population changes of major maize pests in Serbia
VL  - 52
IS  - 3
SP  - 343
EP  - 346
UR  - https://hdl.handle.net/21.15107/rcub_rik_169
ER  - 

@article{
author = "Knežević, Stevan Z. and Bača, Franja and Lević, Jelena and Stanković, Slavica and Stefanović, Lidija and Simić, Milena and Gošić-Dondo, Snežana",
year = "2007",
abstract = "Changes in pest populations occur on a regular basis and can be influenced by various biotic and abiotic factors, including human activites. The objective of this article was to outline several factors that contributed to the population changes in major maize pests over a 50 year period as reported in Serbian literature. Populations of economically important insects, pathogens and weeds were influenced by changes in agronomic practices and introduction of new species. Examples of new pests included: insect species such as western corn rootworm, weed species such as common ragweed and marshelder, and various pathogens including races of Exserohilum turcicum and Bipolaris zeicola. There was also an increase in maize dwarf mosaic virus and barley yellow dwarf virus.",
publisher = "Maydica-Ist Sper Cerealicoltur, Bergamo",
journal = "Maydica",
title = "Factors contributing to the population changes of major maize pests in Serbia",
volume = "52",
number = "3",
pages = "343-346",
url = "https://hdl.handle.net/21.15107/rcub_rik_169"
}

Knežević, S. Z., Bača, F., Lević, J., Stanković, S., Stefanović, L., Simić, M.,& Gošić-Dondo, S.. (2007). Factors contributing to the population changes of major maize pests in Serbia. in Maydica
Maydica-Ist Sper Cerealicoltur, Bergamo., 52(3), 343-346.
https://hdl.handle.net/21.15107/rcub_rik_169

Knežević SZ, Bača F, Lević J, Stanković S, Stefanović L, Simić M, Gošić-Dondo S. Factors contributing to the population changes of major maize pests in Serbia. in Maydica. 2007;52(3):343-346.
https://hdl.handle.net/21.15107/rcub_rik_169 .

Knežević, Stevan Z., Bača, Franja, Lević, Jelena, Stanković, Slavica, Stefanović, Lidija, Simić, Milena, Gošić-Dondo, Snežana, "Factors contributing to the population changes of major maize pests in Serbia" in Maydica, 52, no. 3 (2007):343-346,
https://hdl.handle.net/21.15107/rcub_rik_169 .