【Author:Old Knife Network Shi Yaqin】
On April 16, 2018, Zhou Xu, a grower from Xuzhou, Jiangsu Province, was very confused about the cause of the black spots on the grape grains, and the experts of the farmer's housekeeper gave two judgments, some experts believe that it is grape black pox disease, and some experts think that it is caused by green blind bugs, come and find out.......
There are dark spots on the grape grains
Serving Sannong (Weiwu City, Gansu Province)
For the prevention and treatment of black pox, it is controlled with pentrazole or benzoconazole or benzopiconazole.
Xing Ruifang (Pingdu City, Qingdao, Shandong Province, good at plant protection technology)
For black pox disease, use phenylethicazole or flusilazole or valbutazole or gluconazole for prevention and treatment, spray twice a day.
Zhao Juan (Shouguang, Shandong, good at plant protection technology)
Black pox disease can be used with benzimidazolium or flusilazole or pyrazole or pyrazole ether esters.
Li Chao (Shijiazhuang City, Hebei Province, good at plant protection technology)
Suspected green blind bug hazards
Mao Weishan (Binchuan County, Yunnan Province, good at plant protection technology)
Green blind bug hazards, with imidacloprid, aphid aphid amine, spironium ethyl ester, alenophexamine, acetamidine, thiamethia, control.
Zhai Peijian (Zibo City, Shandong Province, good at soil management)
Grape black pox disease, the main harm to the leaves, the new petiole, the fruit, with the help of wind and rain spread, generally from March to April began to infect, in mid-June, the temperature rises, is the peak period, pay attention to orchard drainage, ventilation, partial application of nitrogen fertilizer, insufficient fertilizer, will induce disease damage, to rational fertilization, not biased nitrogen fertilizer, combined with summer shears, timely binding vines, remove the secondary slight, control the fruit load, isolate germs, increase the application of organic fertilizer, to ensure that the tree nutrients control, can use fluosilazole, imidazole, diphenethiconazole, humus control.
Guo Xinhua (Guan County, Liaocheng City, Shandong Province, Agronomist, Technical Station Manager)
Grape black pox can be controlled with phenylethicazole, methylthiocyclazole, pentrazol, flusilazole imidamide, daisen lian, pyroxystrobin, daisen manganese zinc and so on.
1. Symptoms of black pox disease hazards
Black pox disease is mainly harmful to the green and tender parts of grapes, such as fruit, fruit stems, leaves, petioles, new shoots and tendrils.
First, the branches. The neonatal spots are first rounded brown spots, which later expand to oblong or irregular spots, with purple-red to dark brown edges, gray-brown inside, and a central depression cracked. The spots are often connected into several pieces, and the diseased stalks often die due to the circumcision of the disease spots. Symptoms at tendrils, petioles, flower shafts, fruit stalks, and spike shafts are similar to those of new shoots. The spots on the thick branches become larger ulcers, and the middle is pale and cracked.
The picture shows the initial symptoms of grape black pox branches. The neonatal spots are first rounded brown spots, which later expand to oblong or irregular spots, with purple-red to dark brown edges, gray-brown inside, and a central depression cracked. The spots are often connected into several pieces, and the diseased stalks often die due to the circumcision of the disease spots. Symptoms at tendrils, petioles, flower shafts, fruit stalks, and spike shafts are similar to those of new shoots. The spots on the thick branches become larger ulcers, and the middle is pale and cracked. ----- Farmer Butler app
Second, the blade. The lesions on the leaves are first black-brown spots the size of needles, surrounded by a yellow-brown halo; after enlargement, the spots are round or irregular, 1 to 4 mm in diameter, the edges are purple-brown to black-brown, the central gray-white, and the perforation is broken when dry. Sometimes the spots occur in clusters at the leaf veins, and the spots on the leaf veins are fusiform and slightly concave, and the young leaves are crumpled and twisted into deformities due to the cessation of growth after the leaf veins are killed.
Third, the fruit. The young fruit produces small dots from reddish brown to black brown, and the diseased part is often cracked in the later stage, and the disease grains are more wilted and blackened, and dry and fall off. The grown fruit grains, round spots, 3 to 8 mm in diameter, edges purple-brown to purple-red, brown inside, the center of the gray-white, slightly concave, like a bird's eye, the surface is hardened, sometimes cracked. Multiple spots can be connected into large spots, and the spots are limited to the fruit surface and do not go deep into the fruit, but the fruit taste is sour and loses its edible value.
2. Habitual symptoms of green blind bugs
First, life habits
Green blind bugs are more tender for pest, life is hidden, crawling agility, adult insects are good at flying, sunny days and days more hidden in the grass, morning, night and rainy days crawl to the bud leaves for harmful activities, frequent prick sucking juice in the buds, 1 nymph can stab more than 1,000 times in a lifetime.
Second, harmful symptoms
Adults and nymphs suck the sap of the young organs of grapes through the sucking mouthparts, the damaged young leaves initially appear small black-brown necrotic spots, the leaves grow to form countless holes, the leaf margin cracks, when the leaves are twisted and crumpled, the bud leaves are stretched, the leaf surface shows irregular holes, the leaf margins are mutilated and broken, the buds are killed to produce small black spots, the sap of the fruit is sucked, the young fruit produces black spots, as the fruit increases, the necrotic spots on the fruit surface become larger, and the commodity value decreases; the growth point of the new shoots is damaged with black necrotic spots. But generally the growth point does not fall off.
Green blind bugs endanger grapes---- farmer butler app
Third, it is harmful to crops
Cotton, mulberry, jujube tree, grape, peach, hemp, beans, corn, potato, melon, alfalfa, medicinal plants, flowers, artemisia, cruciferous vegetables, etc.
The above is today's case column to share, if you have better suggestions, welcome to leave a message to discuss.
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