symptom
Perforation has punctures caused by fungi and bacteria. Fungus-induced perforation, such as cherry perforation, is mainly responsible for damage to the leaves, and it also infects shoots. It starts from the lower part of the canopy and gradually expands. In the early stage of the disease, the tip of the leaf was scattered with small purple-brown needle spots. Afterwards, it expanded into a round or near-circular lesion with a diameter of 3 to 5 mm. The brown spots were purple-brown at the edge, and brown spots appeared on the lesions at the late stage. The edge of the rim produces a separation layer, where the lesions dry off and form perforations, while the bacterial-induced perforation disease begins with water-stained round lesions, with yellowish halos surrounding the diseased part, no disease spots in the diseased part, and lesions in the wet. Contaminated yellow secretions overflowed, and the lesions came off to form perforations when dried. In addition to cherry blossoms, the disease also infects cherry, plum, peach, plum, apricot and other stone fruit ornamental plants.
The law of incidence
The cherry blossom spotted hole-blasting pathogenic bacteria wintered at the diseased leaves or tip, and the sprue produced in the following year spread through wind and rain and invaded from the stomata. It starts in June each year and is seriously ill from August to September. The year of heavy winds and rains is very serious, with summer drought and weak tree vigor. Bacterial perforation disease occurs in branch ulcers and in diseased shoots. The temperature rises in the following year. Bacteria spread through wind and rain, insects, and invade from stomata or lenticels. They begin in late April every year, and are seriously ill from June to July.
Control methods
1 In the autumn, diseased foliage is collected and burned to reduce the source of infection.
2 Strengthen management measures, increase organic fertilizer, phosphorus and potash fertilizers, and timely prevent drought and water accumulation to enhance tree vigor and increase resistance.
3 Before and after the leaf spreading (especially for the seedlings), spray 65% ​​Zeoxin 500 times or Baume 3 to 5 degrees lime sulfur or 1:1:100 to 200 times Bordeaux mixture.
4 Bacterial perforation may be sprayed with zinc sulfate lime solution (500 g of zinc sulfate, 2000 g of slaked lime and 120 kg of water) after the leaf is exposed.
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