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Effects of lunar phase on light trap catches of the Malayan black rice bug, Scotinophara coarctata (Heteroptera: Pentatomidae)

Published online by Cambridge University Press:  10 July 2009

Kiyomitsu Ito*
Affiliation:
Tropical Agriculture Research Center, Tsukuba, Japan
Hachiro Sugiyama
Affiliation:
Tropical Agriculture Research Center, Tsukuba, Japan
Nik Mohd. Noor b. Nik Salleh
Affiliation:
MARDI Alor Setar Station, Kedah, Malaysia
Chang Poon Min
Affiliation:
MARDI Rice Research Center, Penang, Malaysia
*
Dr Kiyomitsu Ito, Tropical Agriculture Research Center, Ohwashi 1–2, Tsukuba, Ibaraki 305, Japan.

Abstract

Daily light trap catches of Scotinophara coarctata (Thunberg) were analysed from mid-September 1986 to December 1990 and the physiological status of the trapped adults was examined. The catch size fluctuated synchronously with the lunar phase; large catches occurred around the full moon period and very few adults were trapped around the new moon period. Seasonally, the catches were large from January to March and from July to September, while they were small from May to June and October to November. The seasonal fluctuations of the catches seemed to be related to the growth stages of the rice plants on which the adults multiplied. The sex ratio of trapped adults was biased toward males, unlike that of the cage-reared insects which was 1:1. Most of the trapped females showed undeveloped ovaries and some of these females appeared to have oviposited previously. Light-attracted adults showed a considerable tolerance to starvation and survived for 20–30 days when they were given water, but for only two days in the absence of water. When the light-attracted females were supplied with food, their ovaries developed rapidly and females with mature eggs were produced after nine days. When the starvation period was prolonged, the ovaries remained immature and the fat bodies reduced in size. The nocturnal take-off of the adults was not triggered simply by the full moon illumination. Adult eclosion did not synchronize with the moon cycle.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1993

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