Sugar orange in summer and autumn to prevent rust

In summer and autumn, the rust tick is the peak season of sucrose orange, which mainly damages the leaves and fruits of granulated orange, which causes the leaves to lose green and yellow, weaken the tree potential, make the skin epidermis dark brown, and form “black fruit” to reduce yield. , to reduce quality. The specific prevention methods are as follows:

In the summer and autumn seasons, pay attention to check the leaves and fruits of the sugar orange, and find a layer of light yellowish ash that grows rapidly on the leaves and fruits, or there are individual leaves and fruits on the plant appear dark brown, it is necessary to spray 2~3 continuously. 1500 times 2.8% avermectin emulsifiable concentrate or 1500 times 10% tetramethyl azine wettable powder aqueous solution, 1500 times 0.5% dimethyl disulfide emulsifiable emulsion aqueous solution, 1500 times 20% hydrazine emulsifiable aqueous solution, 1500 times 73 %Keite emulsion oil solution, 3000 times 50% snail ester emulsifiable water solution, etc., spray once every 7~10 days, evenly spray all the technical leaves and fruits inside and outside the canopy to start dropping with water drops It is appropriate. After being sprayed with rain water within 4 hours after spraying, it must be re-applied once to improve the control effect. Because the rust wall of the sucrose orange is very resistant, and it is easy to produce drug resistance, the agent must be used alternately. Do not use the same agent multiple times in succession to avoid drug resistance and reduce the control effect.

(Huang Jianan)