Pear Fruit Noodle spot and Drug Application

There are often irregular spots on the surface of pear fruit, which affect the appearance quality of pear fruit. The spot on the fruit surface is commonly known as the fruit spot, which is caused by the gradual thickening of the cell wall and cork, and the rupture of the epidermis and stratum corneum to reveal the surface, forming brown spots. Another kind of spot is actually "medicine", which is caused by improper medication or excessive pressure when spraying pesticides. There is also a kind of "water clover", which is mainly caused by poor environmental conditions, damp and rainy, poor light, and mold parasitic on the fruit surface.

The occurrence of fruit fruit is related to many factors in cultivation. If the variety and strain are different, the spot will be different. The "big fruit self-fruiting strain" Yali pear in Weixian County, Hebei Province and "Dayali Pear" in Jinxian County have a larger spot area than ordinary Yali pear. The fruit is also related to the inflorescence and the location of the fruit. In the same inflorescence, the higher the position of the inflorescence, the smaller the area of the fruit; for the fruit in the same order, the spot on the outside of the crown is larger than that in the inner chamber. When frost occurs in florescence or young fruit stage, there will be ring-shaped patches, commonly known as "frost ring". The fruit is directly related to spraying. Pear is very sensitive to copper ions in its young fruit stage. if Bordeaux solution is sprayed on it in the middle of June, it is very easy to stimulate the young peel, cause "medicine" and "fruit nut", and increase the fruit spot and rough fruit surface at the same time.

Bordeaux solution should be replaced by carbendazim and methyl thiophanate in the young fruit stage of pear trees. The experiment showed that spraying 25% carbendazim 400 times of carbendazim during the young fruit stage of Cili could reduce the number of pear spots by 1 to 3 times than that of Bordeaux solution, and the fruit-free rate was 68.7%. Do not use a high-pressure spray gun when spraying, use a fine spray nozzle with low pressure instead. If Bordeaux solution is necessary, the proportion of lime can be increased to reduce the copper ion concentration, using a 3x or 240x Bordeaux solution (the weight ratio of cupric sulfate and lime to water ranges from 1:3 to 2pur240).