Question
Biological Control Programme is successfully used in control of cottony cushion scale, Icerya purchasi on fruit trees by:
Solution
Control of cottony cushion scale, Icerya purchasi on fruit trees by its predatory vedalia beetle, Rodolia cardinalis in Nilgiris. The predator was imported from California in 1929 and from Egypt in 1930 and multiplied in the laboratory and released.
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