EFFECT OF VERTIMEC®, A MICROBIAL INSECTICIDE ON THE PINK BOLLWORM, PECTINOPHORA GOSSYPIELLA (SAUNDERS). | ||||
| Menoufia Journal of Plant Protection | ||||
| Article 1, Volume 40, Issue 1, February 2015, Page 169-178 PDF (881.88 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjapam.2015.321149 | ||||
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| Author | ||||
| Dina A. Ahmed | ||||
| Bollworms Dept., Plant Protection Research Institute, ARC, Dokki, Giza, Egypt. | ||||
| Abstract | ||||
| ABSTRACT: The pink bollworm (PBW), Pectinophora gossypiella, is one of the most devastating and invasive insect pests causing immense damage on cotton plants across the world. Adverse effects of microbial insecticide vertimec (product of Streptomyces avermitilis - Avermectin-1.8% w/v) were evaluated against developmental stages of PBW under laboratory conditions. Mortality, LC50 and slope values were estimated for egg and larvae, as well as the latent effects of the vertimec LC50. Bioassay tests showed that the hatchability rate of the eggs decreased in dose dependent manner and it could be noted that the vertimec effect was equal to eggs of one and four days old , where the LC50(s) were 127 and 230 ppm, respectively. Other developmental stage, larvae, was also affected by vertimec. The mortality rates of PBW larvae treating as 1st instar increased with the increase of the used concentration and period after treatment, where the LC50-values calculated after 2 and 7 days of treatment were 0.5950 and 0.3455 ppm. In addition, the biochemical response of P. gossypiella was assessed at two larval stages (2nd & 4th instar) after treatment as newly hatched larvae with vertimec at LC50. The main metabolite levels of the two larval ages (total proteins, total carbohydrates, total lipids and glucose) and some vital enzyme activities (amylase, protease, ALT, AST and AchE) were estimated. | ||||
| Keywords | ||||
| Pectinophora gossypiella; pink bollworm; Streptomyces avermitilis; vertimec; biochemical response; toxicity | ||||
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