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Laboratory evaluation of toxicity of selected insecticides against egg and larval stages of cotton pink bollworm, Pectinophora gossypiella (Saunders) (Lepidoptera: Gelechiidae)

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Journal of Cotton Research 2024年第1期7卷 15-28页

作者： BUSNOOR Abhishek V. WADASKAR R.M. FAND Babasaheb B. TAMBE V.J. PILLAI T. MAHULE D.J. NAGRARE V.S. PRASAD Y.G. Entomology Section College of Agriculture(Dr.Panjabrao Deshmukh Krishi Vidyapeeth)Nagpur 440001MaharashtraIndia Indian Council of Agricultural Research-Central Institute for Cotton Research Nagpur 441108MaharashtraIndia

Background The cryptic nature of pink bollworm Pectinophora gossypiella(Saunders)larvae enables its reduced vul-nerability to insecticidal ***,the development of resistance against Bacillus thuringiensis(Bt)toxins posed a serious threat to transgenic cotton *** necessitated determining the critical timing of spray applications on the control *** study assessed the influence of egg age(freshly laid ***-day-old)and the loca-tion of larvae(directly exposed to the insecticide residues on the boll rind *** inside the bolls)on insecticide control *** The results revealed a significant decrease in the ovicidal activity of tested insecticides with an increase in the age of eggs from one day old to three days old(paired t-test,P80%mortality)than the larvae exposed after they had bur-rowed inside the bolls(pink bollworm management on a sustainable basis.

关键词： Bioefficacy Cotton Insecticides pink bollworm Pectinophora gossypiella Timings of spray

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Fitness of Hybrids between Gossypium barbadense and Upland Cotton and Resistance to Pectinophora gossypiella and Alabama argillacea

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Journal of Life Sciences 2013年第8期7卷 820-826页

作者： Lucia Vieira Hoffmann Paulo Augusto Vianna Barroso Jair Moises de Sousa Flora Ismail Tibazarwa Embrapa Santo Anthonio de Goias 75375-000 Brazil Federal University of Campina Grande Patos Campus University Avenue Paraiba 58700-970 Brazil Department of Botany University of Dar es Salaam Dar Es Salaam 35060 Tanzania

Measuring fitness is essential for understanding the potential impacts of hybridisation between transgenic crops and their wild relatives. Transgenic CrylAc cotton Gossypium hirsutum and G. barbadense hybridise, the latter being valued as backyard cotton and an important genetic resource. G. barbadense was outcrossed to G. hirsutum containing the gene CrylAc and the isoline and the offspring evaluated for fitness as a measure of resistance to common pests and other growth parameters, Resistance to Pectinophora gossypiella and Alabama argillacea were greater in transgenic plants. Number of seeds per plant was higher in the F1 hybrids and G. hirsutum, F2 populations were intermediary; G. barbadense produced the least seeds per plant during the period of analysis. Anthesis of the first flower and opening of the first boll occurred earlier for G. hirsutum and Ft hybrids than F2; latest for G. barbadense. The observed-performance of resistance to the worms in the hybrids suggests that among FI and F2 populations transgenic hybrids may exhibit a competitive advantage over non-transgenic plants as a result of gene flow.

关键词： Biosafety pink bollworm cotton leaf worm gene flow.

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Estimate the Emergence of Pectinophora gossypiella Saunders, （Lepidoptera： Gelechiidae） with Degree Days in the Region of Thessaly, Greece

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Journal of Agricultural Science and Technology(A) 2011年第2X期1卷 182-186页

作者： S. V. Leontopoulos I. K. Vagelas F. T. Gravanis T.E.I. of Larissa Department of Plant Production GR 41110 Larissa Greece

The pink bollworm （Pectinophora gossypiella）, is one of the most damaging pests_of cotton growing in the region of Thessaly in Greece. The time of exit of the adults in spring is an important factor that affects the infestation index in the crop during the summer. Mathematical models by Sevacherian ＆ El-Zik, and Huber, which were implemented in California, were used in this study to determine the beginning, the peak of the adults output and the end of them during the summer. A data comparison between California and region of Thessaly were applied since California and Thessaly are on the same latitude with similar meteorological conditions. The results showed that the emergence occurs when the insect completes 259 DD according to the method described by Sevacherian ＆ EI-Zik, while according to the method described by Huber 430-454 DD are needed. It was observed that either according to the method described by Sevacherian and El-Zik or according to the method described by Huber, the values （DD） showed that the appearance of adults varies between -262 DD to 59 DD and -872 DD to 115 DD respectively.

关键词： pink bollworm Pectinophora gossypiella degree days insect emergence.

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