Evaluation of Chemical Control in A Rotational Program Against Whitefly on Tomato Crop

A.Ayad, Farida; Taha, H.S.; Afsah, A. F.E.; Metwally, S.A.G.; Ayoub, Sherif

doi:10.21608/asejaiqjsae.2009.3238

Evaluation of Chemical Control in A Rotational Program Against Whitefly on Tomato Crop

Document Type : Original Article

Authors

¹ Central Agricultural. Pesticides Laboratory Agric. Res. Center, Giza Egypt.

² Plant Protection Research Institute. Agric. Res. Center. Giza, Egypt.

³ Syngenta Kaha Station, Kalubia Governorate, Egypt. Project # FC/20/28-97, financed from Bureau de Liaison AgricoJe., Franco-Egyptien.

10.21608/asejaiqjsae.2009.3238

Abstract

A chemical control program against Bemisia Tabaciwas applied after treatment of tomato seedlings variety Rover F1 hybrid in the nursery using thiamethoxam and imidacloprid. In addition, six treatments with different rational and conventional insecticides in a rotational program have been applied at Syngenta Kaha Station, Kalubia Governorate, Egypt. Two treatments were sprayed according to the proposed economic threshold (less than one adult per compound leaf) rotationally. Another two treatments were sprayed periodically every 6 days without taking into consideration the degree of infestation. The last two treatments were used as block application and sprayed every 6 days twice using the same chemical.The results showed that the best treatment was the block application, in the sequence of thiamethoxam, lambda-cyhalothrin, pymetrozine, pyriproxyfen and imidacloprid, fenpropathrin, pyriproxyfen, pymetrozine. They gave the highest efficacy on the adults of whitefly and obtained high yield of tomato crop. Regarding the virus infestation, both treatments showed the least number of infested plants with minimal surfaces of viral symptoms. The present study suggests that block application was a good rotational program in reducing the number of chemicals and reducing the hazard of pesticides to the environment.