Methyl Bromide Fumigation for Destruction of the Strawberry Crown Borer12

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Abstract
The strawberry crown borer, Tyloderma jragariae, is a serious pest of strawberries in the area including western Kentucky, southern Illinois, Missouri, Arkansas and Tennessee. To improve upon present control methods which are mainly cultural, a study was made of CH3Br fumigation at atmospheric pressure as a means of destroying all stages of crown borer in plants to be used for setting new patches. Complete mortality of adults was secured with a minimum dosage of 2 pounds of CH3Br per 1,000 cu. ft. of space for a 2-hr. period within a range of 68-85[degree] F. No eggs survived fumigation with 3 lbs. per 1,000 cu. ft. for a 2-hr. period between 61[degree] and 84[degree] F. No larvae survived fumigation with 3 lbs. of CH3Br per 1,000 cu. ft. for a 2-hr. period at temps. above 70[degree]. Dormant plants were uninjured by a 2-hr. exposure to 3 lbs. of fumigant per 1,000 cu. ft. at temps. below 80[degree]. Fumigation of dormant strawberry plants before Apr. 1 with a dosage of 3 lbs. of CH3Br per 1,000 cu. ft. of space for a 2-hr. period at a minimumtemp.of 70[degree] is suggested to free plants of crown borer.

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