Application of Metham Sodium by Sprinkler Irrigation to Control Lettuce Drop Caused bySclerotinia minor

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Abstract
In laboratory experiments, metham sodium killed nearly 100% of the sclerotia of S. minor in soil at rates as low as 25 .mu.g a.i.[active-ingredient]/ml of water. In 3 field tests, metham sodium applied at 234 l of product per hectare through sprinkler irrigation with 2.4-5.2 cm (1.0-2.1 in.) of water killed 100% of the sclerotia retrieved from plots 1-2 days after application. The incidence of lettuce drop in control plots ranged 14-58%, whereas that in plots treated with metham sodium ranged 0-6%. The amount of metham sodium applied to the fields was 25-33% of the manufacturer''s recommended rate and provided 89-91% disease control.

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