Gansu Farmers News October 17th Consulting: Hello experts! The phenomenon of leaf shrinkage is common in pepper seedlings that I planted in the greenhouse recently. What is the problem? What should I do?
Answer: The causes of heart and leaf shrinkage in pepper seedlings are mainly caused by viral diseases, fleas and phytotoxicity:
First, there are two main types of heart leaf shrinkage caused by mosaic virus, one is light mosaic virus and the other is heavy mosaic virus. The light mosaic virus showed a slight chlorosis of the leaf veins, or a mottle between the shades, but the diseased plants had no obvious deformities or dwarfs and no leaves. The diseased leaves of the heavy mosaic virus appear yellow-green mottled, with uneven and uneven leaves, and the leaf veins shrinking, causing the heart leaves to shrink. This kind of situation can be sprayed with some anti-viral drugs, such as 20% hydrochloric acid morpholinium copper WP 500 times plus 2% nannanmycin water 300 times, or 5 oysters proteoglycan water 200~300 times .
Second, the genus damage caused by heart leaf shrinkage, the main performance is the tender leaves, tender stems and leaves are gray brown or yellow brown back, and has an oily luster, or was oily, curling leaves edge down. Anthraquinones are the major mediators of viral diseases and should be strengthened as soon as possible. Can choose 1.8% abamectin EC 3000 ~ 4000 times, or 1% matrine soluble liquid spray 600 times, spray focus on the back of the leaf, flower and young fruit.
Third, the damage caused by injury leaves, one is hormonal poisoning, the second is excessive pesticide concentration caused poisoning. The main manifestation is that the leaf veins near the growth point are twisted and twisted, the leaf surface is thick and stiff, the leaf color is dark, and the leaf margin is rolled up. Seriously, it will cause the whole plant to occur, especially the heart. This type of situation can be sprayed with 1.4% sodium nitroprusside solution 600 times plus nucleotide leaf fertilizer 500 times, can alleviate the disease.
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