How to prevent and cure the disease and insect of Achyranthes bidentata

The disease during the growth period of Achyranthes bidentata is mainly white rust, which is characterized by damage to the aboveground parts of the plant, yellowish green patches on the leaf surface, outstanding blister protuberances on the back, 1 mm in diameter, and white and glossy sticky powder after the epidermis is ruptured. The diseased leaves turn yellow and brown when blister spots occur for a long time. Occurs in the petiole bud and other parts, resulting in light yellow spots, and then into white blister spots, the diseased stem is often swollen and twisted.

The incidence rule of white rust is that the pathogen overwintered mainly as oospores in the damaged tissue or adhered to seeds, and then germinated to produce sporangia and zoospores. Zoospore sprouting produces bud tube and invades the host from stomata to cause the disease. The sporangia produced on the host disease spot are transmitted by wind and rain, causing re-infection. In addition, the mycelium can also overwintering on the remaining plants, resulting in sporangium transmission.

White rust is usually aggravated by low temperature and high humidity. The optimum temperature for sporangium and oospore germination was 10 ℃, the lowest was 1 ℃, and the highest was 20 ℃. Sporangia and oospores could not germinate at high temperature (more than 25 ℃) or drought. If qi

The large temperature difference between day and night and the condensation of dew are beneficial to the germination and invasion of sporangia. White rust is easy to occur in spring and autumn overcast and rainy weather and poorly drained fields.

In the prevention and control measures, mainly from the improvement of cultivation techniques for prevention. First, pay attention to crop rotation, deep ploughing and removal of diseased and disabled tissues. Second, in the cold and rainy season in spring, trench drainage reduces the humidity in the field. Third, from the first ten days of March, 40% ethylphosphine aluminum 200 × 300 liquid was sprayed or 50% methyl topiramate 800 × 1000 liquid, or metalaxyl, Bordeaux solution, etc., were used for chemical control.

In addition, planting Achyranthes bidentata should also pay attention to the occurrence of blackhead and nematode disease. Blackhead disease mostly occurs in spring and summer, mainly because the cover of Reed head is too thin, frozen in winter, causing blackness and mildew. The method of prevention and control is to pay attention to drainage and waterlogging and cultivate soil in winter. Nematode disease mostly occurs in low altitude areas, forming uneven sarcomas on the roots. Attention should be paid to the selection of soil in prevention and control, and the soil can be treated with 35-45 kg Didi mixture per mu.

The insect pests of Achyranthes bidentata in the whole growth time are mainly caterpillars and red spiders, which generally occur from May to June every year, and the damage is serious when the weather is dry. Prevention and control can use Dongguo emulsion 500g plus water, 1000 kg, spray control. In addition, pay attention to weeding, but also avoid intercropping with beans, cotton and other intercropping or adjacent cropping.

The great ape leaf worm that harms Achyranthes bidentata usually occurs in May-June, and the symptom is that the insect bites the leaves into small holes. For control, it can be sprayed with 800 times of imidophos or 1000 times of trichlorfon.

The large temperature difference between day and night and the condensation of dew are beneficial to the germination and invasion of sporangia. White rust is easy to occur in spring and autumn overcast and rainy weather and poorly drained fields.

In the prevention and control measures, mainly from the improvement of cultivation techniques for prevention. First, pay attention to crop rotation, deep ploughing and removal of diseased and disabled tissues. Second, in the cold and rainy season in spring, trench drainage reduces the humidity in the field. Third, from the first ten days of March, 40% ethylphosphine aluminum 200 × 300 liquid was sprayed or 50% methyl topiramate 800 × 1000 liquid, or metalaxyl, Bordeaux solution, etc., were used for chemical control.

In addition, planting Achyranthes bidentata should also pay attention to the occurrence of blackhead and nematode disease. Blackhead disease mostly occurs in spring and summer, mainly because the cover of Reed head is too thin, frozen in winter, causing blackness and mildew. The method of prevention and control is to pay attention to drainage and waterlogging and cultivate soil in winter. Nematode disease mostly occurs in low altitude areas, forming uneven sarcomas on the roots. Attention should be paid to the selection of soil in prevention and control, and the soil can be treated with 35-45 kg Didi mixture per mu.

The insect pests of Achyranthes bidentata in the whole growth time are mainly caterpillars and red spiders, which generally occur from May to June every year, and the damage is serious when the weather is dry. Control can use Dongguo emulsion 500g plus 1000 kg of water, spray control. In addition, pay attention to weeding, but also avoid intercropping with beans, cotton and other intercropping or adjacent cropping.

The great ape leaf worm that harms Achyranthes bidentata usually occurs in May-June, and the symptom is that the insect bites the leaves into small holes. For control, it can be sprayed with 800 times of imidophos or 1000 times of trichlorfon.