Population dynamics of castor semilooper (Achaea janata Linn.)(Noctuidae: Lepidoptera) and its control
1991
Sarichai Titawattanakul
Population dynamics of castor semilooper, Achaea janata Linn.(Noctuidae:Lepidoptera) and its control were carried out both under laboratory and field conditions at Suwan Farm, Nakhon Ratchasima. This study included population dynamics and chemical control of castor semilooper. Biological and partial ecological life table of castor semilooper were constructed. The spatial pattern of distribution of A. janata was contigious and the regression line between the population of castor semilooper and rainfall was y = 247.41-4.57X. Toxicity tested by leaf dipping method, indicated that carbaryl, methomyl, cypermethrin and carbosulfan were highly toxic for the control of the first and second instar larvae, but monocrotophos was highly toxic for the first instar larvae and moderately toxic for the second instar larvae of castor semilooper bases on their LC50. In field conditions, all insecticides used on castor semilooper gave satisfactory control. There were no difference between insecticides but results differed from the nontreated subjects. Life table analysis yielded the following population parameters: the net reproductive rate (Ro) = 76.2272 the cohort generation time (Tc) = 34.6756, the capacity for increase (rc) = 0.7876 and the finite rate of increase (lambda) = 2.1981
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