Evaluation the Effects of the Entomopathogenic Fungus Beauveria Bassiana (Ascomycota: Hypocrales) on some Histological and Physiological Parameters for the Green Bug Nezara Viridula (L.) (Hemiptera: Pentatomidae)

Document Type : Original Article

Authors

1 Department of Applied Entomology and Zoology, Faculty of Agriculture, (El-Shatby), Alexandria University, Egypt

2 Plant protection Research institute, Agriculture research center, Dokki, Giza, Egypt

3 Applied Entomology and Zoology, Faculty of Agriculture (El-Shatby), Alexandria University, Alexandria, Egypt.

Abstract

The present study aimed to determine the effect of the entomopathogenic fungus Beauveria bassiana on some histological changes in the mid gut (mesenteron) of Nezara viridula adultsafter 24, 48, and 72 hours of treatment. Also, its effect on some physiological parameters as α-amylase, lactate dehydrogenase (LDH) activities. The contents of some minerals (calcium, inorganic phosphorous, and magnesium) has been studied. The histological studies showed several malformations in the treated N. viridula adult's midgut. Fungal infection caused damage in different sites of the midgut after 48 and 72h of treatment. The α-amylase activity, increased significantly, in the infected adult. The highest increase in the α-amylase activity was exhibited after 24h of infection and then gradually decreased after 48 and 72h of treatment. On contrary, the LDH activity was significantly reduced in the infected adults; after 24h  of treatment. With regard to the minerals, all tested minerals content were decreased significantly, in the infected adults, irrespective of the time after fungal treatment. Beauveria bassiana could be considered as a promising model for biological control of the green bug N. viridula.
 

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