The mechanism of the control of turnip flea beetle by benzene hexachloride dressings on brassicae seed

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Abstract
Laboratory experiments have shown that kale seedlings recently emerged from seed treated with γ‐BHC are highly toxic to flea beetle. This toxicity falls rapidly in the week following emergence of the seedlings but their protection against material damage by flea beetle is maintained for another 2 or even 3 weeks. The experiments indicate that initial protection is due to γ‐BHC from the seed dressing contaminating the seedling leaves directly. When the plants are about a week old the insecticide reaches the leaves systemically through the roots; some is then volatilized through the leaves in amounts causing low mortality of the insect but, nevertheless, preventing it from causing serious damage to the plant.

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