Apple powdery mildew mainly damages the seedlings or young shoots and leaves of apple trees, and can also harm buds, flowers and young fruit. Visual Testing is the automated process of detecting and reviewing visual UI changes.Manually testing your app for across multiple browsers and devices is a tedious process, but you can accelerate it with automated visual testing that goes beyond pixel-by-pixel screenshot comparison. Visual Testing Ketone Meter,Visual Testing,Ketone Test Kit,Ketone Strips FdaKetone Test,Urine Rapid Test Strips,Animal Test Strip,Test Strips Diabetes Weight Loss Changchun Medicon Technology Development Co., Ltd , https://www.jlmdk.com
Symptoms: Young shoots are infected, growth is inhibited, internodes are shortened, and the blades on which they are growing become narrow or not open, they become hard and brittle, and the leaf margins are rolled up. The initial surface is covered with white powder, which turns brown later. Later, the white powder gradually spreads to both sides of the leaf. The frontal leaves are uneven in color and the back of the leaf produces white powdery spots. The diseased leaves become narrow and the edges are wavy and shriveled or the leaves are uneven. In severe cases, the diseased leaves are The tip or leaf edge gradually becomes brown, and finally the whole leaf is dry and falling off. The bud is affected, grayish brown or dark brown. Slender and thin, loose scales, the upper can not be folded into a brush, the surface of hair less, severe death of dry and dry. After sprouting in the spring, the growth is slow and it is not easy to develop. The flower buds were damaged. The light petals became pale green, thinning and lengthening. The sepals and pedicels were deformed; the pollinating and fertilizing abilities of the female and the stamens were lost, and finally they died of dryness; the severe buds shrank and died. Damage to young fruit occurs in the vicinity of the cocoons, resulting in white patches on the cocoons and hardening of the diseased areas. After the fruits grow, the white powder falls off and forms a network of rust spots. The hardened tissue forms a crack or crack later. Fruit stem damage, young fruit shrinking early. The victim’s fruit surface has a cork pattern. ?
Control methods
1, dormant winter pruning: removal of disease buds, reduce the source of overwhelming bacteria;
2. Spraying during the growth period: The key period of protection is in the spring. Use 15% triadimefon (triaden) 1000-1500 times, 70% thiophanate-methyl (thiophanate-methyl) 1000 times wave (50) % thiophanate-methyl 800 times), both protective and therapeutic. In places where resistance to the above agents occurs, Fuxing, beclomethaside, and higher pesticides may be used.
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