ON THE POWDERY MILDEW (UNCINULIELLA AUSTRALIANA McAlp.) OF CRAPEMYRTLE (LAGERSTROEMIA INDICA L.) Ⅲ. Chemical control of the powdery mildew

During the period of crapemyrtle spouting and growing out its new shoots, Gao-zhi-mo'…a new protective fungicide×100, which was sprayed one time for every 10 to 15 days, showed better protective effect than that of lime-sulphur after three times continuously. As the powdery mildew of crapemyrtle prevailed, if Bauleton (Triadimefon) was sprayed, the epidemic of the powdery mildew would be controlled. Mixing 10 g of 70% Topsin-M (or 10 g of 15% Triadimefon) and 200 g moist soil and dusting them into a furrow around the diseased tree showed better control effect than spraying the same chemical fungicides.