The present work was devoted to study the impact of some recent insecticides pertaining to biorational insecticides group that have low mammalian toxicity i.e, [chlorantraniliprole, spinetoram, methoxyfenozide, thiamethoxam and lambdacyhalothrin]which were sprayed individually and/or mixed with each other against the American bollworm (ABW) Helicoverpa armigera during the consequent growing cotton seasons of 2014 and 2015 at Al Zeiny -Abohoms, El-behaira Governorate, Egypt. Results of the study showed that the admixed different compounds [ Voliam Flexi ® 40 WG (Chlorantraniliprol 10%+ Thiamethoxam 20 %), Engeo® %24.7 SC (Thiametoxam 14,1%+ Lambda-cyhalotrina 10,6%), Radiant ® 12% SC (Spinosyn JL) and Runner ® 24% SC (methoxyfenozide)] gave the highest efficient activity upon the population of H. armigera larvae. It could be also said that, the mixing of each of these different compounds together had a strong effect on the annihilation of the population of ABW H. armigera larvae more than their use individually.
Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) tomato leaf miner is a major pest of the Solanaceae family, this studs was carried out in the open field of three potato varities (Espunta, Mondial and Pliny) at Al-Bustan, Nubaria Western Delta in Egypt in two evergreen (winter and Summer) using pheromone traps as an indicator to infestation by this pest. Also, the parasitoid Trichogramma evanscens (Hymenoptera: Trichogrammatidae) was evaluated to suppressing the infestation as a biological control. Also, the relationship between the adult moth of T. absoluta and temperature o C and relative humidity RH% throw the winter and summer evergreens studied. The result indicated that the population of T. absoluta adult moth in pheromone traps increased in winter evergreen during October and November (19-22°C) and summer evergreen during May and June (23 o-26 o C) in warm climates. The results revealed that Tr. evanscens gave a high significant in reducing the T. absoluta in open field and greatly exacerbates role of natural enemies.
To reduce global warming caused by the overuse of conventional chemical pesticides used for pest management, this study tested the effectiveness of okra and corn as banker plants with Trichogramma evanescens release for the sustainable management of cotton bollworms in comparison to conventional chemical pesticides and the release of T. evanescens alone (control). We found that okra and corn with T. evanescens release were more effective in decreasing the incidence of cotton bollworms than the conventional chemical pesticides or T. evanescens alone. We also found that okra and corn encouraged the spread of bollworm natural enemies in the treated cotton fields, which had a large impact on the number of cotton bollworm larvae, thus reducing the need for conventional pesticides. Thus, banker plants combined with T. evanescens release can support agrobiodiversity and help realize the integrated management of the cotton bollworm by reducing the use of conventional chemical pesticides and contributing to global warming reduction.
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