Pear rust
Pear rust occurs in various pear producing areas across the country, infecting the leaves and also damaging the fruit. Pear rust occurs more commonly in the southern regions where there are more species of cypress plants than in northern China.
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Symptoms: When the bacteria invaded the leaves, they appeared orange on the front of the leaves. The lesions were slightly concave. The needles were dense with yellow needle-shaped spots on the front. The lesions on the back of the leaves slightly protruded, and the yellow-brown hairs appeared later. , For the pathogen rust device, the top of the rust device breaks down after ripening, and the yellow-brown powdery substance is rust spores. Symptoms on fruits and stalks are similar to those on the back of the leaves, and onset of young fruit can cause malformation and early fall.
?? The characteristics of the disease? The pathogen only infected pear trees in the spring, is a typical single disease course. The bacteria used perennial mycelium to overwinter at the site of the occurrence of typ. The teliospore angle swells when the pear tree sprouts in the leaf development stage. The spores germinate and spread to the pear tree with the wind, resulting in infestation. The teliospores spread within 5,000 meters. Different sporozoites are formed on the front of the pear leaf. Spread to the cypress plants along the wind, and the more summer and winter it passes. The number and distance of Coriaceous plants are important factors affecting the occurrence of pear rust. During the period of pear tree sprouting and leafing, it is beneficial to the water swelling of the phosporus horn and the germination of the teliospore, and the wind and wind force are conducive to the spread of germs.
Control methods
1. Eradication of cypress plants within 5,000 meters around the pear orchard is the most fundamental method for preventing pear rust.
2. Spraying on the cypress plants inhibited the germination of teliospores and the infection of rust robes. For those species of cypresses that cannot be removed, the diseased branches should be removed and destroyed before the spring syringes germinate, or sprayed once with lime sulfur or 80% sodium pentachlorophenol to inhibit teliosporn germination.
3, spray protection pear tree. In the severe ward area, the fungicide was sprayed on the pear leaf during the leaf stage and after the flower was dropped to prevent the infection of the spores. Pharmacy 1:2:200 times Bordeaux mixture, or 15% triadimefon 1000 times.