The Effects of Gene Type on the Occurrence of Petiole Spot in Chinese Cabbage and Resistance Varieties Screening;

Studies on the occurrence and sensitivity to the chemicals of black-dot disease of bagged apple;

Researches on black-dot disease of bagged apple in Shaanxi showed that the disease started in early July,become serious in the early and middle of August and reached peak by the end of August.

It has been made clear that the occurrence regularity of black-dot disease of bagged apple in Shaanxi according to the experiments conducted from 2000-2003.

To control the red and black scars on the surface of the apples by using plasfic film bags is to take the following comprehensive measures:strengthening the planting management,adding more fertilizer,increasing Ca in soil,improving the condition of wind and sun light between the trees,selecting non -static electricity plastic film bags,bagging in time,adjusting humidity in bags and bacterium from.