PNABD246.pdf

insects ranged from 5 to 10 days for females and 5 to 8 days for males.
However, lifespan of non-mated insects was between 9 and 21 days for females,
and between 5 and 12 days for males. The larval stage consisted of four instars
each lasting 2.3, 2.7, 3.7 and 4.9 days, respectively. [AS]
*0799 Fujii, K. ; Miyazaki, S. 1987. Infestation resistance of wild legumes
(Vigna sublobata) to adzuki bean weevil, Callosobruchus chinensis (L.)
(Coleoptera: B.uchidae) and its relationship with cytogenetic classification.
APPLIED ENTOMOLOGY AND ZOOLOGY, v.22(2):229-230. [Eni (A:PS)
The ability to infest various species of beans in genus Vigna by adzuki
weevii (Callosobruchus chinensis) was discussed. The present study supports the
results of previous cytogentic studies which suggested the existence of two
groups within wild Vigna species, V. mungo var. silvestris (Syn. V. sublobata,
race I), and V. radiata var. sublobata (Syn. V. sublobata, race II), the
supposed progenitors of V. mungo and V. radiata, respectively. In view of the
immediate deaths of bean weevil larvae upon feeding, the feeding deterrent in
V. mungo and V. sublobata race I seems not to be due to the lack of nutritional
elements for C. chinensis but rather to the existence of some toxic chemicals.
Further studies with other bean weevils are required. [THHJ
*0800 Thanthianga, C. ; Mitchell, R. 1987. Vibrations mediate prudent
resource exploitation by competing larvae of the bruchid bean weevil
Callosobruchus maculatus. ENTOMOLOGIA EXPERIMENTALIS ET APPLICATA,
v.44(I):15-21. [EnJ [En Abst] (A:PS)
Larvae of the bean weevil C. maculatus feeding in a single bean apparently
respond to vibrations from each other's chewing: one larva feeds normally, the
other is inhibited. If the burrows of the larvae intersect, the inhibited larva
dies. If the dominant larva pupates or dies without the burrows intersecting,
the iuhibited larvae then feeds and matures if enough food remains. Since
females add second eggs to the largest beans after most beans carry a single
egg, competition is most common in the largest available beans, precisely where
inhibited larvae can benefit from avoiding a contest. [AS]
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