INFLUENCE OF METARHIZIUM ANISOPLIAE-BASED DESTRUXIN A-760 AND DESTRUXIN - A-724 ON THE SUGAR BEET FLY, PEGOMYA MIXTA VILL. (DIPTERA:ANTHOMYIIDAE)

Abstract

ABSTRACT Sugar beet contains about 15-20% sugar is considered a very important economic crop which produces the sugar in all worlds and also in Egypt. The sugar beet fly, Pegomya mixta Vill. belongs to (Diptera: Anthomyiidae), causing a damage to sugar beet crop plantations causing a blotch or "blister". Metarhizium anisopliae is entomopathogenic fungus produce toxin called Destruxin (DEX). This toxin could to paralysis the insects, also cause pests death. Destruxin 760and Destruxin A-724 examined in the laboratory by six concentrations. the lethal concentration LC50 was 76 and 141 ppm when sugar beet fly, P. mixta was treated by Destruxin- 760and Destruxin A-724, respectively. After the Destruxin A-760 and Destruxin A-724 applied on P. mixta, the number of eggs was significantly decreased by 29.8 and 1.1% fold. Destruxin-724 caused higher malformations to sugar beet fly, P. mixta the toxin Destruxin-760 caused a reduced of the target insects. Under field conditions, sugar beet weight recorded 2497±93.19 and 2799±58.98 kg/ 4200 m2 in plots treated with Destruxin 760 during seasons 2018 and 2019 respectively. Also the sugar beet weight increased after Destruxin -724 increased to 2415± 53.66 and 2625±68.91 Kg/fed. during seasons 2018 and 2019 , respectively as compared to 1680±65.43,1680±65.43 and 1120±85.09, 1120±85.09 kg/ feddan among the plots treated with water during the two successive season (2018 & 2019), respectively. use of M. anisopliae isolated toxin of Destruxin A-760, Destruxin - A-724 effect on the sugar beet fly, P. mixta larvae, pupae and adults in the laboratory. They also tested in the field and results obtained reduced the P. mixta numbers in the field.