Laboratory studies on the rate of development and oviposition of Callosobruchus chinensis L. on different varieties of green gram (Phaseolus aureus Roxb.)

Laboratory studies on the rate of development and oviposition of Callosobruchus chinensis L. on different varieties of green gram (Phaseolus aureus Roxb.)

1983

REP.MB-2692

Callosobruchus chinensis L. (Coleoptera: Bruchidae) attacks mungbean (Vigna radiata Wilczek). The influence was studied of the temperature, relative humidity, and host plant variety on its development and oviposition. The egg period was shortest at 70% relative humidity and longest at 30%. The percentage hatch exceeded 80% between 20 C and 30 C, whereas no eggs hatched at 40 C. The highest hatch rate (more than 90%) was observed at 70% relative humidity, the lowest at 90%. The mean developmental period was shortest at 30 C and 70% relative humidity. Most beetles emerged at 25 C. Out of the varieties tested, Utong I, H 101, and CES 87 were found to be relatively resistant to beetle damage (lower development of adults with prolonged developmental periods), whereas MI 3, Local CV 1 and Type 51 were highly susceptible. Under experimental conditions, the highest number of eggs were laid on the first day. [AS]

v.21(3):347-353, BEITRAEGE ZUR TROPISCHEN LANDWIRTSCHAFT VETERINAERMEDIZIN

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