Evaluation of the use of entomogenous nematode, <I>Steinernema feltiae</I> (str. Mexican) for the biological control of the fall webworm, <I>Hyphantria cunea</I>, (Lepidoptera: Arctiidae)
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概要
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The entomogenous nematode, <I>Steinernema feltiae</I> (Mexican), were evaluated both in the laboratory and in the field for their use for the control of 3rd instar larvae of the fall webworm. The larvae were infected and then killed by <I>S. feltiae</I> within 24 hrs at the rate of 1, 000 and 5, 000 infective juveniles (J<SUB>m</SUB>) per insect larva and killed within 48 hrs at the rate of 100 and 500 J<SUB>m</SUB> per larva at 25°C under laboratory conditions. In the first trial (June 24-26, '85), when the humidity was very high and the temperature moderate, the nematodes persisted on the leaf surface of cherry trees even 40 hrs after application. The infestation of nematodes at the rate of 3, 000 J<SUB>m</SUB>/ml resulted in 100% mortality of the fall webworm 17 hrs after foliage application. In the second field trial (June 27-29, '85), under high humidity and low temperature conditions, a higher survival rate of the nematodes and a higher mortality rate of the insect were obtained for higher concentrations of the nematode water suspension. In the third field trial (August 15-16, '85) when the humidity and temperature conditions were favorable for the nematode persistence 11 hrs after application, and thereafter became unfavorable in the daytime, nematodes sprayed on the surface of the leaves died 22 hrs after the application. The mortality of the insect larvae, however, reached 85.1% at the rate of 3, 000 J<SUB>m</SUB>/ml.This concluded that <SUB>S. feltiae</SUB> (Mexican) can be use as biological control agents against the fall webworm on tree leaves.
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日本線虫学会 | 論文
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