Effects of the main ecological factors on gallnut yield

Tree，moss and aphid are three necessary factors to produce gallnut．The composition of their different quantities directly affects the gallnut yield．By using orthogonal combination design，an experiment was carried out to study the effects of sumac，winter host mosses and spring migrant on yield of gallnut．The results showed that gallnut yield is linearly intluenced by the numbers of sumac(Rhus chinensis Mil1．)，area of winter host mosses(Plagiomnium maximoioziiT．Kop)and quantity of spring migrant(Schlechtendalia chinensis )separatly as well as their different combinations．The amount of spring migrant has the largest effect on gallnut yield,followed by the number of sumac and area of winter host mosses．The results may be useful for cultivation of gallnut.