Canopy- and Ground-Dwelling Predatory Arthropods in Commercial &lt;I&gt;Bt&lt;/I&gt; and non-&lt;I&gt;Bt&lt;/I&gt; Cotton Fields: Patterns and Mechanisms

Torres, Jorge B.; Ruberson, John R.

doi:10.1603/0046-225x(2005)034[1242:cagpai]2.0.co;2

Cited by 64 publications

(59 citation statements)

References 39 publications

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“…Our Þndings support those of other laboratory studies using other Bt proteins and are consistent with the lack of effects observed on populations of this predator in the Þeld (Head et al 2005, Torres and Ruberson 2005, Naranjo 2009). …”

Section: Discussionsupporting

confidence: 92%

Effects of Bt Cotton on Thrips tabaci (Thysanoptera: Thripidae) and Its Predator, Orius insidiosus (Hemiptera: Anthocoridae)

Kumar¹,

Tian²,

Naranjo³

et al. 2014

j econ entomol

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Laboratory studies were conducted to investigate tritrophic transfer of insecticidal Cry proteins from transgenic cotton to an herbivore and its predator, and to examine effects of these proteins on the predatorÕs development, survival, and reproduction. Cry1Ac and Cry2Ab proteins from the bacterium Bacillus thuringiensis (Bt) produced in Bollgard-II (BG-II, Event 15985) cotton plants were acquired by Thrips tabaci Lindeman (Thysanoptera: Thripidae), an important sucking pest of cotton, and its generalist predator, Orius insidiosus (Say) (Hemiptera: Anthocoridae). The average protein titers in BG-II cotton leaves were 1,256 and 43,637 ng Cry1Ac and Cry2Ab per gram fresh leaf tissue, respectively. At the second trophic level, larvae of T. tabaci reared on BG-II cotton for 48 Ð96 h had 22.1 and 2.1% of the Cry1Ac and Cry2Ab levels expressed in leaves, respectively. At the third trophic level, O. insidiosus that fed on T. tabaci larvae had 4.4 and 0.3% of the Cry1Ac and Cry2Ab protein levels, respectively, expressed in BG-II plants. O. insidiosus survivorship, time of nymphal development, adult weight, preoviposition and postoviposition periods, fecundity, and adult longevity were not adversely affected owing to consumption of T. tabaci larvae that had fed on BG-II cotton compared with non-Bt cotton. Our results indicate that O. insidiosus, a common predator of T. tabaci, is not harmed by BG-II cotton when exposed to Bt proteins through its prey. Thus, O. insidiosus can continue to provide important biological control services in the cotton ecosystem when BG-II cotton is used to control primary lepidopteran pests.

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Section: Discussionsupporting

confidence: 92%

Effects of Bt Cotton on Thrips tabaci (Thysanoptera: Thripidae) and Its Predator, Orius insidiosus (Hemiptera: Anthocoridae)

Kumar¹,

Tian²,

Naranjo³

et al. 2014

j econ entomol

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“…Nymphal nabids screened from Bt corn in the fi eld indicated that these natural enemies were among the three orders (Araneae, Coleoptera, and Heteroptera) found to contain Cry1Ab endotoxins above the threshold of 0.5 ng Cry1Ab per gram of fresh weight (Harwood et al 2005 ). However, in fi eld studies, the abundance of predators, including nabids, across 3 years in cotton fi elds with standard grower practices failed to exhibit any negative impact of Bt cotton on predator populations (Torres and Ruberson 2005 ). Nabids were among the arthropod faunae in orchard ground cover where plant species richness was a major driver for the fauna communities, both for the arthropod and pollinator assemblages (García and Miñarro 2013 ).…”

Section: Tritrophic Interactionsmentioning

confidence: 99%

Damsel Bugs (Nabidae)

Coscarón

Braman

Cornelis

2015

True Bugs (Heteroptera) of the Neotropics

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Damsel bugs, Nabidae, are valued predators in agricultural and urban systems. Worldwide, there are considered to be 31 genera and 386 species known, with 11 genera and 83 species from the Neotropical region. While little bionomic information is available for Neotropical nabid species, highlighting the need for future research, the biology of Nabis (Tropiconabis) capsiformis Germar, is representative of the family. N. (T.) capsiformis demonstrated a type I functional response when feeding on bollworm eggs. Under laboratory conditions, total generation time was 51.6 days. Nabids insert their eggs into plant tissue with only the operculum remaining visible. N. (T.) capsiformis averaged 105.3 eggs/female. Much remains to be discovered concerning this fascinating and important group of predatory heteropterans. Knowledge about biology and taxonomy of this group is fundamental to developing future programs in integrated pest control.

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“…Transgenic Bt cotton has provided an important tool for developing an integrated pest management (IPM) strategy [10,11], especially for lepidopterous larvae in cotton [12][13][14][15]. GM cotton expressing Cry genes is cultivated on 33.1 million ha in different cotton growing countries including United States [16,17], China [18][19][20], India [21][22][23][24][25][26], South Africa [27][28][29], Mexico [30], Argentina [31,32] and Pakistan [33][34][35][36][37][38][39][40][41][42][43] and experienced many benefits like reduced use of broad-spectrum insecticides, improved control of target pests, reduced production cost, increased yield and better opportunity for biological control.…”

Section: Transgenic Bt Cottonmentioning

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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Canopy- and Ground-Dwelling Predatory Arthropods in Commercial <I>Bt</I> and non-<I>Bt</I> Cotton Fields: Patterns and Mechanisms

Cited by 64 publications

References 39 publications

Effects of Bt Cotton on <I>Thrips tabaci</I> (Thysanoptera: Thripidae) and Its Predator, <I>Orius insidiosus</I> (Hemiptera: Anthocoridae)

Effects of Bt Cotton on <I>Thrips tabaci</I> (Thysanoptera: Thripidae) and Its Predator, <I>Orius insidiosus</I> (Hemiptera: Anthocoridae)

Damsel Bugs (Nabidae)

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

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