บทคัดย่องานวิจัย

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The effects of temperature and humidity on oviposition and developmental period of Oryzaephilus mercator (Fauvel)

N. E. S. Lale, P. Dudu and S. N. Okiwelu

Postharvest Biology and Technology Vol: 8 Issue: 1, April 1996, Pages 75-79.

1996

บทคัดย่อ

The effects of temperature and humidity on oviposition and developmental period of Oryzaephilus mercator (Fauvel)

In a laboratory assessment of the potential tolerance of the Merchant beetle, Oryzaephilus mercator (Fauvel), to temperature and humidity, both adults and immature stages were exposed to different levels of these factors.

Temperature investigated were 20, 30 and 37°C and relative humidities (RHs) were 30, 50, 70 and 90%. There were significant direct and interactive effects of the factors on oviposition so that higher numbers of eggs were laid as both temperature and RH increased. Low temperature and low humidity, however, inhibited the hatching of these eggs, and no larvae were produced at 20°C and 30% RH, even with prolonged incubation. Temperature appeared to be a more important factor determining the duration of the life-cycle of this beetle as its development was generally quicker with increasing levels of this factor. Oilseeds may be less susceptible to O. mercator in agroecologies with sub-tropical climates where temperatures and humidities are relatively low.