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The Effects of Chemical Treatment On Tylenchulus Semipenetrans and Citrus Tree Response During 8 Years

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For more content, see Nematology.

Thirty-year-old citrus trees were treated for "slow decline" caused by citrus nematodes (Tylenchulus semipenetrans) with applications of 56 or 37 liters per ha (6 or 4 gal per acre) of an emulsifiable formulation containing 75% by weight of 1,2-dibromo-3-chloropropane (DBCP). Populations of citrus nematodes on the roots of the trees and tree response were studied for 8 years. Over 99% control of nematodes was obtained with both application rates. Tree growth improved, and fruit yields and average size of fruit increased within 2 years after treatment. The nematode populations increased slowly, reaching economically damaging levels after 5 years. At this time, tree growth began to decline, and average size of fruit became smaller. Trees re-treated with 37 liters of DBCP per ha after 4 years did not revert to decline. Trees in advanced stages of decline recovered as rapidly as trees showing less severe symptoms of decline after both initial and retreatment.

Affiliations: 1: Crops Research Division, Agricultural Research Service U.S. Department of Agriculture, Orlando, Florida, and Phoenix, Arizona, U.S.A


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