Effect of Certain Insecticides and Fungicides on Plant Emergence and Control of the Seed-Corn Maggot1

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Abstract
Lindane and dieldrin were used with a fungicide or inert carrier to treat seeds of green pea, spinach, onion, cotton, and 9 varieties of cucurbits for control of the seed-corn maggot, Hylemya cilicrura (Rond.). Insecticides were used as slurries and as dusts at 1/3, 2/3, and 1.5 lbs. and the fungicide at 1 1/2 and 3 oz. per 100 lbs. of seed. Emergence counts of cucurbits indicated an insecticide and a fungicide, thiram, must be combined to control seed-corn maggots and seed-decay organisms. The insecticides used were equally effective in controlling maggots. Used without the fungicide, seed was more susceptible to decay organisms. Machine- and acid-delinted cotton seed was treated with lindane and Ceresan M. No differences as a result of treatments were found. Plant emergence of green pea, onion, and spinach seeds treated with lindane and dieldrin at 1/4, 1/2, and 1.5 oz. plus thiram at 3 oz. was not adversely affected. Lindane plus thiram combinations gave the best seed protection.

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