Influence of Bacillus thuringiensis- Transgenic and Nectariless Cotton on Insect Populations with Emphasis on the Tarnished Plant Bug (Heteroptera: Miridae)
| Autor: | W. W. Bryan, D. D. Hardee |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Journal of Economic Entomology. 90:663-668 |
| ISSN: | 1938-291X 0022-0493 |
| DOI: | 10.1093/jee/90.2.663 |
| Popis: | Comparison of Bacillus thuringiensis transgenic and nectariless cottons with non-B. thuringiensis commercial varieties >2-yr showed no significant differences in number of beneficials, bollworm [Helicoverpa zea (Boddie)), and tobacco budworm [Heliothis virescens (F.)] eggs, fruiting sites per plant, and percentage square set. Significantly more tarnished plant bugs, Lygus lineolaris (Palisot de Beauvois), and percentage of crazy cotton were observed in B. thuringiensis 757 (Coker 312 background in 1994) and in Coker 312 variety in 1995 compared with other varieties, suggesting no effect of B. thuringiensis gene insertion in cotton on the number of tarnished plant bugs. Transgenic cotton had significantly fewer bollworms and budworms, cabbage loopers [Trichoplusia ni (Hobner)], and percentage of damaged squares than the other varieties, 75% as many beet armyworms [Spodoptera exigua (Hobner)), and had no effect on fall armyworm [Spodoptera frugiperda (J. E. Smith)]. The transgenic character itself did not cause an increase of any insect population, but consultants and producers are encouraged to monitor other insect pests, especially boll weevil, Anthonomus grandis grandis Boheman, and tarnished plant bug. These pests may cause economic damage when fewer or no sprays are used for bollworm and budworm in cotton. Nectariless MD51 had fewer plant bugs than other varieties both years, but also lower yield. These results suggest transgenic cotton is a useful tool in tile management of certain lepidopterous pests. |
| Databáze: | OpenAIRE |
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