The iImportance of studying the cytogenetic effect of the various insecticides and fungicides which are being used to protect crops against insct pests and diseass appears not to have been sufficiently recognised by cytogenetis and plant reeders.Though the best insecticides and fungicides are those which kill the plant parasites without affecting the plant organism some of them have been found tto affect the host plant to various ways and degrees.Thus for example ethyl metcuric chloride which is the active substance of the funbicide "Granosan"induces atypical growth,abnormal mitosis and polyploidy. Almost similar effects have been seen in the case of Hexachlorocyclohexane (666)which has of late found widespread use as an insecticides.Hexachlorocylohexane stimulates the germination of certain cruciferae initially,but the growth of such treated seedlings become strikingly suppressed later on.
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Tamil Nadu Agricultural University
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Madras Agricultural Journal (MAJ)
Madras Agricultural Students Union
Tamil Nadu Agricultural University
Coimbatore - 641
003
Tamil Nadu, India.
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