Predaceous Arthropods and Lepidopteran Pests on Conventional, Bollgard, and Bollgard Ii Cotton Under Untreated and Disrupted Conditions

Hagerty, Aaron M.; Kilpatrick, A. L.; Turnipseed, S. G.; Sullivan, Michael J.; Bridges, William C.

doi:10.1603/0046-225x-34.1.105

Cited by 42 publications

(32 citation statements)

References 14 publications

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“…(Dutton et al, 2002(Dutton et al, , 2003. Hagerty et al (2005) reported that populations of the predators (Geocoris sp., Orius insidiosis (Seg. ), Nabis spp., Solenopsis invicta Buron, spiders, coccinellids, and lacewings were at par or high in Bollgard I and Bollgard II transgenic cottons as compared to the non-transgenic ones.…”

Section: Discussionmentioning

confidence: 99%

Influence of transgenic cottons with Bacillus thuringiensis cry1Ac gene on the natural enemies of Helicoverpa armigera

2007

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Transgenic cotton has been released for cultivation in several parts of the world to increase crop productivity. However, concerns have been raised regarding the possible undesirable effects of genetically modified crops on non-target organisms in the eco-system. Therefore, we studied the effects of transgenic cottons with cry1Ac gene from Bacillus thuringiensis Berliner (Bt) on the natural enemies of cotton bollworm/ legume pod borer, Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) under field and laboratory conditions. There was no apparent effect of transgenic cotton on the relative abundance of predatory spiders (Clubiona sp. and Neoscona sp.), coccinellid (Cheilomenes sexmaculatus Fab.), and the chrysopid (Chrysoperla carnea Stephens). However, the abundance of spiders, coccinellids, and chrysopids was quite low in insecticide protected plots towards end of the cropping season. There was a significant reduction in cocoon formation and adult emergence of the ichneumonid parasitoid, Campoletis chlorideae Uchnida reared on H. armigera larvae fed on the leaves of transgenic cottons before and after parasitization. However, no Bt toxins were detected in H. armigera larvae and the parasitoid cocoons with enzyme linked immunosorbent assay. Reduction in cocoon formation was because of early mortality of the H. armigera larvae due to Bt toxins in the leaves of transgenic cotton. There was a slight reduction in adult weight and fecundity, and prolongation of the larval period when the parasitoid was raised on H. armigera larvae fed on the leaves of transgenic cotton before and after parasitization. Survival and development of C. chlorideae was also poor when H. armigera larvae were fed on the leaves of cotton hybrid Mech 184. The adverse effects of transgenic cotton on survival and development of C. chlorideae were largely due to early mortality, and possibly poor nutritional quality of H. armigera larvae due to toxic effects of the transgene.

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Section: Discussionmentioning

confidence: 99%

Influence of transgenic cottons with Bacillus thuringiensis cry1Ac gene on the natural enemies of Helicoverpa armigera

2007

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“…Since Bt-crops are intended to replace or reduce applications of conventional insecticides commonly used in agriculture, insecticide treatments should be considered as one reasonable baseline for a comparative risk assessment [1,3,30]. Experiments that included broad spectrum insecticides, such as pyrethroids and organophosphates, have shown consistently reduced abundances of different groups of predators and hymenopteran parasitoids (Bt-maize [47][48][49]; Bt-cotton [42,43,[50][51][52][53]). Side effects of more selective insecticides such as indoxacarb (anoxadiazine) or spinosad (amacrolide) largely depended on the spray frequency [49] whereas systemic insecticides (such as imidacloprid, a neonicotinoid) were found to have no or little effect on natural enemies [54].…”

Section: Higher-tier Studies In the Fieldmentioning

confidence: 99%

Ecological Impacts of Genetically Modified Crops: Ten Years of Field Research and Commercial Cultivation

Sanvido

Romeis

Bigler

Green Gene Technology

110

102

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“…The introduction of Bt cotton in Southeast Asia significantly reduced the insecticide applications by 72%, increased yield of 11.4% and an estimated profit of US $126.02/ha [56]. The reduced insecticide use may increase the predator abundance and can affect the arthropod communities overall in Bt cotton field [57][58][59][60][61].…”

Section: Gm Cotton and Insecticide Usementioning

confidence: 99%

Transgenic Bt Cotton: Effects on Target and Non-Target Insect Diversity

Arshad¹,

Khan²,

Aslam³

et al. 2018

Past, Present and Future Trends in Cotton Breeding

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Occurrence of diversity in ecosystem sustains particular characteristic of a biological community and also ensures stability of the community. Transgenic crops may affect insect biodiversity by unintended impacts on non-target arthropod population. For example, transgenic GM cotton specific to target lepidopterous pests can change the cotton pest spectrum and may induce the growth of new harmful pest species having no pest status. The change in species composition may influence IPM approach in cotton crop. The results of authors' research studies as well as global impact indicate that GM cotton is highly specific to target pests and has no unintended impact on non-target insect population. GM cotton provides significant season-long field control of target pests (Helicoverpa armigera, Earias spp. and Pectinophora gossypiella), with no significant control of Spodoptera species. The decreased insecticide use in GM cotton has a positive impact on beneficial insect populations and can increase the stability of rare species. Bt cotton has no resistance against non-target sucking insect pests. As GM cotton has no adverse effects on the non-target insect population and can reduce the use of broad-spectrum insecticides, it can become an important tool of IPM program in cotton agro-ecosystem of Pakistan.

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Predaceous Arthropods and Lepidopteran Pests on Conventional, Bollgard, and Bollgard Ii Cotton Under Untreated and Disrupted Conditions

Cited by 42 publications

References 14 publications

Influence of transgenic cottons with Bacillus thuringiensis cry1Ac gene on the natural enemies of Helicoverpa armigera

Influence of transgenic cottons with Bacillus thuringiensis cry1Ac gene on the natural enemies of Helicoverpa armigera

Ecological Impacts of Genetically Modified Crops: Ten Years of Field Research and Commercial Cultivation

Transgenic Bt Cotton: Effects on Target and Non-Target Insect Diversity

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