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Effectiveness of Dyrene in controlling Stemphylium leaf spot of birdsfoot trefoil



Effectiveness of Dyrene in controlling Stemphylium leaf spot of birdsfoot trefoil



Plant Pis Reptr 46(7): 509-512



In the southeastern U. S., birdsfoot trefoil (Lotus corniculatus) is severely attacked by diseases, 1 of which is Stemphylium leaf spot caused by S. loti. The most active stage occurs during May and June and again in mid-fall. In the spring, infection starts on the oldest or 1st-initiated leaves and progresses upward with maturity of the plant, causing loss of 25 - 66% of the total leaves initiated. Early in the investigation of this disease approximately 400 lb. of forage was determined lost when 66% of the total initiated leaves were defoliated. After over 100,000 trefoil seedlings were screened for resistance to Stemphylium leaf spot, the degree; of resistance was found to be low and complex. Hence, a temporary method of suppressing the disease was undertaken until a high degree of resistance could be found. In preliminary tests with various fungicides and antibiotics, 2,4-dichloro-6-(o-chloroanilino)-s-triazine (Dyrene) was the most effective in suppressing this disease. In 1959, 1960, and 1961 Dyrene (50% wettable powder) was applied to 6- x 7-ft. plots of trefoil at weekly, biweekly and triweekly intervals and at 3, 4, 5, and 6 lb. of active chemical/acre for each application interval. The leaves initiated and the leaves infected and defoliated by S. loti were counted on 25 plants at random for each treatment at each harvest date. Each concentration of Dyrene at each of the application intervals reduced forage loss caused by S. loti defoliation. Application of 6 lb. Dyrene/acre at weekly intervals increased total annual average forage yield by 2431 lb./acre over untreated plots. Also, the numbers of leaves infected and defoliated, respectively, were 3.0 and 3.5 times greater in untreated plots than in plots with the most effective treatment (6 lb./acre, 7-day interval). At present, fungicides are probably not economical for use on forage crops. They are, however, an excellent tool for determining actual forage loss caused by foliage diseases.

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