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Paper Information

Journal:   APPLIED ENTOMOLOGY AND PHYTOPATHOLOGY   September 2002 , Volume 70 , Number 1; Page(s) 37 To 48.
 
Paper: 

BIOLOGY OF THE SUGAR BEET WEEVIL BOTHYNODERES OBLIQUEFASCCIATUS MENETRIES IN THE WARM AND DRY REGIONS OF ESFAHAN PROVINCE

 
 
Author(s):  ZARABI M.M., MOHARAMIPOUR S., NOURI GHANBALANI GH., KHALAGHANI J.
 
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Abstract: 

In this study some of the important aspects of the biology of the sugar beet weevil B. obliquefasciatus, a serious pest of early season in warm and dry regions of Isfahan province, was investigated. The adult weevils emigrate from their hibernation sites and feed voraciously by on the cotyledons of the sugar beets upon their emergence. The female oviposite on the surface of the cotyledons. The first instar larvae emerge during 7± 0.73 days under the 28°C and 24% relative humidity condition. They make a hole in the leaf and fall down in cracks of the soil near the roots. They feed from the roots and complete their growth after 4 instar during 15-20 days then pupate in their feeding hole in roots or in a soil cocoon near the ground surface. Pupation period is 10-15 days. This pest has one generation annually and the new generation will overlap with the old one. The population fluctuation studies in this region during 1990 and 2000 revealed that number of captured weevils increase slowly from May to June, based on the period of beet culturing, and then decrease. It increases again to its highest amount in July when the new generation appears and finally decreases till August.

 
Keyword(s): BOTHYNODERES OBLIQUEFASCIATUS, BIOLOGY, WARM AND DRY REGIONS, ESFAHAN
 
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