Glasshouse Fumigation with Formaldehyde

SUMMARY Fumigation for 1 hr in a 50 cu. ft (1.42 cu. m) chamber with a rate eqmvalent to 0.75 lb potassium permanganate/3 pt formaldehyde/ 6,000 cu. ft (0.34 kg/1.70 1./169.90 cu. m) killed spores of Botrytis cinerea, Fulvia fulva and Fusarium culmorum , though in a series of 1 hr fumigations based on this rate the mycelium of B. cinerea was not killed. Fumigations for 24 hr in a 50 cu. ft (1.42 cu. m) chamber and a commercial glasshouse with 0.75 lb potassium permanganate/3 pt formaldehyde/6,000 cu. ft (0.34 kg/1.70 1./169.90 cu. m) and 0.8 lb/ 1.25pt/6,000cu. ft (0.36 kg/0.71 1./169–90 cu. m) killed both spores and mycelium of B. cinerea .