Kan suksa thang niwet-witthaya khong non ron kin maprao Latoia lepida (Cramer) (Lepidoptera : Limacodidae) lae sattru thammachat nai prathet Thai.
1982
Thavesak Chayopas
Studies on some ecological aspects of the slug caterpillar, Latoia lepida (Cramer) (Lepidoptera: Limacodidae), and its natural enemies were conducted both in laboratory and field conditions. Eggs were laid in masses on the underside of the leaflet, the eggs usually overlapped a little at the ends. The female moth produced on average 538.4 plus minus 177.2 eggs during the incubation period of 5 - 6 days. The mean duration of eleven larval instars of L. lepida were 1.0535 plus minus 0.2270, 3.6315 plus minus 0.4954, 3.8571 plus minus 0.3550, 3.1000 plus minus 0.3038, 4.2500 plus minus 0.8397, 3.1667 plus minus 0.3779, 3.8333 plus minus 0.3780, 3.6389 plus minus 0.4875, 4.1940 plus minus 0.4013, 40833 plus minus 0.2802 and 5.6562 plus minus 0.8654 days respectively. The total larval stage averaged 41.6562 plus minus 1.5576 days. The growth increment in terms of the width of head capsule assumed a geometric progression with a ratio of 1.322. The longevities of adult male and female were 4.3076 plus minus 2.3588 days and 4.6471 plus minus 1.3201 days respectively. Life table analysis gave the following parameters: the net reproductive rate (Ro) = 146.4916, the capacity for increase (rc) 0.0689, the cohort generation time (Tc) = 72.2806 and the finite rate of increase (gamma) = 1.0714. The survey of natural enemies of L. lepida yielded four species of parasites. Apanteles parasae Rohwer and Euderastichus sp. were found as larval parasites of L. lepida, while the tachinid, Chaetexorista javana Brauer and Bergenstamm and the chrysid, chrysis shanghaiensis Smith were found as pupal parasites.
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