مقايسه اقتصادي وفني كنترل شيميايي وبيولوژيك سفيد بالك پنبه(BEMISIA TABACI) در مزارع پنبه استان فارس

Economic und Technical Comparison of Chemical and BiolngicaJ Control of Bemlsia rabaci in Cotton Fields in Fars Province

In order /0 clarif} the efficiency of biological control method or Bemssia wbuCi ill field and Io compare jl!:> chemica) approach Irom the viev,roillt of technical and economical aspects. this research \.\3" carried OIlT for .~ yearʹ, since 19()Cj in Dnrab eounl; in Fars province. Results indicated that E mundns could parasitize 95~ʹn of llLʹJl1111U tabaci honeydew in peak period Dr pest incidence and prevented the losses of cotton. Based on production function results, total insecticide used per hectare and number or insecticide spraying application had a Significant effect on cotton production in Darab county Research also showed that in the period ofresearch more than 50% of tartncrs increased the number of spraying application beyond the recommended dose and did it in the third region of production function, Findings of j-year experiment showed that fields with higher number of spraying limes had mere inrenstvc honeydew infection. Based on prices in 2002 ami 4 liners insecticide application per hectare. f-ern economic view point. chemical control metJ10d could be replaced \vith biologicul method which was at most 184000 Rʹals per hectare. Acvordh-g to the results of this study. btologice! control or Bemisia mbact is recommended