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A biological and Toxicologiacal Study of Striped Rice Borer Chilo suppressalis (Waalker)
Thesis Abstract:
A laboratory study was made of the biology of C. suppressalis and the response of four larval instars to five insecticides.
The total development period of C. suppressalis on rice (Rexoro variety), from egg laying to adult emergence, covered 42 to 59 days for the female and 39 to 54 days for the male, with a average of 48.7 days, respectively, Incubation period was 5 to 7 days, or an average of 5.3 days
There were 6 larval instar. The first and second instars ranged from 3 to 5 days, with an average of 3.6 and 3.5 days, respectively. The third instar lasted from 4 to 5 days, or an average of 4.3 days for the demale and 4.1 days for the female and the male, respectively. The fifth instar ranged from 4 to 7 days, with an average of 6.0 days for the female and 5.2 days for the male. The sixth occurred from 8 to 19 days, with the female average of 14.4 days and the male, 11.0 days.
The total harval period lasted from 31 to 43 days for the female and 28 to 38 days for the male with respective average of 36.4 and 31.5 days. The pupal period ranged from 6 to 9 days, with the female averaging 7.0 days and the male, 6.9 days. A female could lay from 20 to 202 eggs, or an average of 118.6.
Of the five insecticides used in the toxicological study, methyl parathion was the most toxic to all the larval instars tested and malathion and lindane, the least. The oolder instar learvae were more susceptible to endrin lindane, methyl parathion and diazinon than the early instar, but the reactions were reverse with mlathion.