MySheen

Control of brown spot perforation of peach leaves

Published: 2024-11-05 Author: mysheen
Last Updated: 2024/11/05, Occurrence rule: The pathogen overwinters mainly by mycelium on diseased leaves or diseased tissues of injured branches. The following spring, with the rise in temperature and the arrival of rain, the pathogen produced conidia. Conidia spread by wind and rain, infecting leaves, shoots and fruits. The disease occurs more seriously in low-lying, poorly ventilated, cloudy orchards or rainy years. Control methods: (1) Agricultural control: reasonable pruning. Make orchard ventilation and light transmission good, reduce the humidity of peach orchard, create unfavorable conditions for disease occurrence.

Occurrence regularity: the pathogen overwintered mainly by mycelium on the diseased leaves or in the diseased tissues of the damaged branches. The following spring, with the rise of temperature and the arrival of Rain Water, the bacteria produced conidia. Conidia are transmitted by wind and rain, infecting leaves, shoots and fruits.

The disease is more serious in low-lying, poorly ventilated, wet orchards or rainy years.

Prevention and control methods:

(1) Agricultural prevention and control: reasonable pruning. Make the orchard ventilated and transparent, reduce the humidity of peach orchard, and create conditions that are not conducive to the occurrence of diseases.

(2) artificial prevention and control: sweeping the ground with fallen leaves and fruits, and concentrated burning to eliminate the source of overwintering bacteria.

(3) Chemical control: before the peach tree germinated (bud germination period), the whole tree was evenly sprayed with 4-5 Bomedo stone-sulfur mixture, or 1-Rutl 100 Bordeaux solution, 40% formearsine wettable powder 100-fold solution, to eradicate the source of bacteria that overwintered on the branches. Starting from peach calyx removal, spray 65% Dysen zinc wettable powder 500x liquid, or 70% mancozeb wettable powder 500x liquid, or 75% chlorothalonil wettable powder 500x 600x liquid, or 50% isomide wettable powder 1500 times liquid, or 50% sulfamethoxazole wettable powder 1500 times liquid every 10 to 14 days.

 
0