Developmental period and percent parasitism of Haplogonatopus atratus esaki et hashimoto (Hymenoptera : Drynidae), a nymphal parasitoid of smaller brown planthopper, Laodelphax striatellus fallen, in overwintering generation.
1989
Kim J.B.
A series of study was carried out to investigate some binomics of Haplogonatopus atratus, a nymph parasitoid of the smaller brown planthopper (SBPH) under field and laboratory conditions. The development period from egg to adult emergence at 15 deg C, 25 deg C and 30 deg C were averaged 55.7, 38.6, 25.1 and 19.0 days, respectively. The ovipositin period, longevity, and number of eggs laid by female were determined under at 26-28 deg C. Average longevity of female and male were 10 and 3.6 days when SBPH nymphs and honey were supplied together as food. Female laid an average of 17.2 eggs with the maximum of 24. The oviposition period was 5.6 days. More than 72.6 % of the wasps emerged in the morning between 7 and 10 a.m. while very few emerged in the afternoon. The average sex ratio between male and female was 1:1.3 when the wasps were developed from fertilized eggs. The wasp parasitism of nymphal stage of SBPH in overwintering generation from 1986 to 1988 years at eleven different observation locations in the southern part of Korea were averaged 13.3% at Hapchen, 22.9% at Oychang, 12.8% at Hamyang, 11.1% at Milyang, 14.9% at Kimhae, 9.2% at Gosung, 25.8% at Chinju, 12.8% at Hodong, 14.7% at Sancheong, 18.0% Chinyang, and 16.4% at Ulsan, respectively.
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