Effect of sequence control sprays on cotton bollworms and side effect on some sucking pests and their associated predators in cotton fields. | ||
| Egyptian Academic Journal of Biological Sciences. A, Entomology | ||
| Article 21, Volume 3, Issue 1, June 2010, Pages 221-233 PDF (379.09 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/eajbsa.2010.15258 | ||
| Author | ||
| Al-Shannaf H. M. H. | ||
| Plant Protection Research Institute, Agric. Res. Center, Dokki, Giza, Egypt | ||
| Abstract | ||
| Field evaluation of sequence control sprays were carried out at Abou-Hamad district, Sharkia Governorate, Egypt in the two successive cotton growing seasons 2008 and 2009 against cotton bollworms, Pectinophora gossypiella (Sound.), Earias insulana (Boisd.) and Heliothis armigera (Hüb.) infesting cotton green bolls as well as some sucking pests and some important predators. The seasonal average reductions in cotton bollworms infestation attained 66.67 and 61.18 % in 2008 and 2009 seasons. Conventional insecticides mixture IGRs treatments attained 91.82 and 84.42 % in 2008 season of Nezara viridula and Tetranychus spp.; 90.13 and 75.38% of N. veridula and Aphids in 2009 season, respectively. The lowest mean numbers of insects were 0.78 and 1.48 insects/week of Tetranychus spp. and N. viridula in 2008; 0.41 and 3.33 individuals/week in 2009 season in treatments of true spiders and N. viridula compared with untreated plots recorded 0.96 and 1.48 in 2008 season of true spiders and N. viridula, while in 2009 the lowest mean numbers were 1.26 and 7.93 individuals/week of Tetranychus spp. and N. viridula. The tested programs resulted in the highest degree of % reduction for all investigated predators except for Chrysoperla carnea attained 99.54 ,94.05 and 91.89 % of Peaderus alfierii, Coccinella spp. and Scymnus spp. in 2008.In 2009 seasons the highest reduction were 100.00, and 84.30 % of Coccinella spp. and Scymnus spp. The insect predators (Chrysoperla carnea, Coccinella spp. Orious spp., Peaderus alfierii, Scymnus spp., and true spiders) were influence significant and insignificant relationship in the two seasons and ranged between positive & negative relationship. On the other hand, results indicate that the all predators affect sucking pests with 29.73, 32.54; 35.57,83.22; 61.88,83.54; 49.14,46.26 and 52.46,58.26% mutable regression values of Aphis gossypii, B. tabaci, Emboasca lybica, N. viridula and Tetranychus spp. during 2008 and 2009, respectively. | ||
| Keywords | ||
| cotton bollworms; Predators; cotton fields | ||
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