• Korean journal of applied entomology
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• v.29 no.1
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• pp.1-5
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• 1990

A morphological study on the immature and adult stages of Anagrus incarnatus Haliday was carried out under laboratory condition at 25$\pm$1$^{\circ}C$. The egg is sausage-shaped with a long slender pedicel. The first instar is a bag-shaped larva. The second instar larval form of A. incarnatus is similar to he "histriobdellid" stage. The antenna has 9 and 13 segments of the female and male, respectively. The first funicular segment of the female's antenna is very short, subspherical or globular type and the third funicular segment with one sensory ridge is longer than the forth. The forewing of A. incarnatus has 8-9 rows of discal hairs providing no bare space at the broadest part. The length of ovarian eggs, egg, 1st instar, and 2nd instar of A. incarnatus is 0.165, 0.215, 0.290, and 0.535 mm, respectively, and the width of each stages is 0.025, 0.057, 0.082, and 0.110 mm, respectively. The developmental periods for egg, 1st instar, 2nd instar, prepupa, and pupal stage are about 1, 1, 4, 1, 5-6 days, respectively.pectively.

• Korean journal of applied entomology
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• v.30 no.2
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• pp.101-105
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• 1991

The host finding, ovipostition of Anagrus incarnafus Haliday and the sex ratio of its offsprings was determined. Both male and female mate immediately after emergence and the female parasitoid search for host eggs by drumming with antenna immediately after release on the rice seedings. Time required for the host searching, drumming with antenna, tapping and inserting with ovipositor, and ovipositing of A. incarnaws takes 188.5, 17.5, 72.4 and 206.7 seconds, respectively. The time required for mating takes 16-21 seconds. The sex ratio of offsprings between female and male was about 3: 1 in mated females and all the offsprings emerged from the eggs of unmated females were males. So, A. incarnafus can reproduce zygogenetically and parthenogenetically and the mode of parthenogenetic reproduction was an arrhenotokous parasitoid.

• Korean journal of applied entomology
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• v.29 no.4
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• pp.217-221
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• 1990

Some biological phenomena of Anagrus incarnatus Haliday, an egg parasitoid of planthopper, were studied under three different constant temperatures. Duration from egg to adult emergence of the parasitoid from the BPH eggs were 21.5, 13.6 and 10.6 days under $20^{\circ}C$, $25^{\circ}C$ and $30^{\circ}C$, respectively. Rate of the development was highly correlated with temperature. The critical temperature was estimated as $10.0^{\circ}C$ and the effective degree days was 210.3 day-degree. Durations for the development of A. incarnatus under 25$\pm$$1^{\circ}C$ (16L : 8D) were 12.4, 12.5 and 12.1 days from eggs of N. lugens, S. furcifera and L. striatellus, respectively. Duration of the development of A. incarnatus from 1, 3, 5, 7 days old BPH eggs were 12.5, 12.1, 12.9 days, respectively. The average longevity of adult was 5.3 days under 25$\pm$$1^{\circ}C$. Number of the ovarian and practically oviposited eggs were 34.8$\pm$28 and 28.3$\pm$0., respectively. Female A. incarnatus laid most of the eggs within few days after the emergence ; over 60% within 24 hours, nearly 90% upto the 2nd day, and nearly 100% upto the 3rd day.