Recent situation of the Colorado beetle (Leptinotarsa decemlineata) in Poland

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Abstract
During the last 20 years there have been two outbreaks (1972 and 1976) of the Colorado beetle and one decline (1980). The new outbreak in 1983 was unusually massive as the population density of the pest was 2–3 times higher than in previous years. Almost 100% of potato crops and more than 50% of plants were attacked by the pest. This was due to low mortality of hibernating beetles during winter of 1982/83 and very favourable weather conditions in 1983 which resulted in an early emergence of hibernating beetles in the spring, intensive migration and high female fecundity. In 1983 insecticide treatments were applied to an area of 3.49 million ha as compared to 1.8 million ha treated in an average year. In 1984 there was a serious decline of the Colorado beetle population.

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