What are the common pests and diseases in Cyathula officinalis cultivation?
What pests and diseases affect Cyathula officinalis? How to prevent and control them? The main pests and diseases during the growth period of Cyathula officinalis are: white rust, black head disease, nematode disease, caterpillars, red spider mites, and large flea beetles. The control methods can refer to the following; Cyathula white rust: the symptom is that all aboveground parts of the plant can be affected, manifesting as damage to the leaves,...
What pests and diseases affect Cyathula officinalis? How to prevent and control them? Please introduceThe main pests and diseases during the growth period of Cyathula officinalis are: white rust, black head disease, nematode disease, caterpillars, red spider mites, and large flea beetles. The control methods can refer to the following;
Cyathula white rust:The symptom is that all aboveground parts of the plant can be affected, manifesting as damage to the leaves: pale yellow-green patches appear on the leaf surface, and corresponding blister-like protrusions grow on the underside, 1-2 mm in diameter. After the epidermis ruptures, a white, glossy, sticky, slippery powdery substance is released. When many blister spots occur, the diseased leaves turn yellow, wither, and become brown. When it occurs on parts such as leaf stalks and young buds, pale yellow spots are produced, which later become white blister spots, and the diseased stems are often swollen and twisted. A large temperature difference between day and night, with dew condensation, is favorable for the germination and invasion of sporangia. In spring and autumn with continuous rainy weather and in poorly drained fields, white rust is prone to occur.
Control methods:Prevention should mainly start with improving cultivation techniques. First, pay attention to crop rotation, deep plowing, and removal of diseased plant residues. Second, in the cold, rainy spring season, open ditches to drain water and reduce field humidity. Third, starting in early March, spray 40% phosethyl-Al at 200-300 times dilution, or use 50% thiophanate-methyl at 800-1000 times dilution, or use metalaxyl, Bordeaux mixture, etc. for chemical control.
Cyathula black head disease and nematode disease:
Black head disease mostly occurs in spring and summer. It is mainly caused by the rhizome head being covered too thinly, suffering frost damage in winter, and then becoming black and moldy. The control method is to pay attention to drainage and waterlogging prevention, and to earth up the soil in winter.
Nematode disease mostly occurs in low-altitude areas, forming uneven fleshy galls on the roots. For control, pay attention to soil selection. Per mu, 35-45 kg of dichloropropene mixture can be used to treat the soil.
Cyathula pests:Caterpillars and red spider mites generally occur from May to June each year, and cause serious damage when the weather is dry. For control, 500 g of Dongguo emulsion can be added to 1,000 kg of water and sprayed. In addition, pay attention to weed control, and also avoid intercropping or adjacent cropping with beans, cotton, and similar crops.
Cyathula large flea beetle:It generally occurs from May to June. The symptom is that the insects bite the leaves into small holes. For control, phosmet at 800 times dilution or trichlorfon at 1000 times dilution can be sprayed to kill them.
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