Pear brown spot control method

Pear brown spot control method

The disease, also known as white spot disease and spot blight, harms the pear leaves, and can cause a large amount of defoliation in the pear leaves.

[Hazardous symptoms]

A round or near-circular brown spot initially appeared on the leaf blade, and later developed into an oval or irregular shape, a central grayish white, a brown surrounding area, and a large lesion with a black outer layer. The center of the lesion was densely black, and the center of the lesion became white and star-shaped. It was easy to perforate and the diseased leaves fell early.

[Incursion]

The pathogens winter in deciduous lesions. In the case of spring rain the following year, spores were produced, spread through wind and rain, and invaded the leaves of the pears to form lesions, and spores were re-infested at the lesions. The field can be seen in late April, and the most severe onset of rain is May-June. The low humidity in the orchard and the canopy closure will aggravate the disease. Among the varieties, there are more diseases such as autumn, bright moon, and late Katsura of Imamura.

[Control methods]

(1) Clearing the garden in winter, collecting the diseased leaves and burning them, deep plowing, and deep defoliation.

(2) Strengthen the orchard's management of water and fertilizers and enhance the resistance of the tree to disease.

(3) In conjunction with the control of other diseases, 1:2:180 Bordeaux mixture is sprayed during the leaf spreading period, and 50% carbendazim WP 1000 times or 75% thiophanate WP 1000 times is sprayed during the disease development period. Or 50% acetaminophen WP 1000 times, or 40% polysulfide 500 times, preferably 2 consecutive sprays.

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