Biological Studies on Zygogramma bicolorata Palltstei (Coleoptera : Chrysomelidae), a Potential Biocontrol Agent of Parthenium hysterophorus L. (Asteraceae)
Biological studies were carried out in Bangalore on the leaf feedingÂ chrysomelid beetle, Zygogramma bicolorata Pallister, introduced forÂ biological control trials against the neotropical weed PartheniumÂ hysterophorus L. (Asteraceae). The insect completed its development in 27-29Â days at 25.5 Â± 1Â°C. sex ratio was in favour of females, with the malesÂ constituting only about 30% of the population. However, males lived longerÂ (l22-271 days) than females (109-198 days). Although females were capableÂ of laying up to 3368 (mean 2590.8) eggs each, only 30-52 % hatched.
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