What are the pests and diseases of okra? How to prevent it? Second brother is an okra grower. As an "experienced person", let me give you a summary, so that you can take fewer detours on the road of planting.
1. Viral disease: Virus disease of okra mostly occurs from seedling stage to early growth stage, mainly manifested as deformed mosaic and etched necrotic spots. At the beginning of the disease, the veins of young leaves fade and soon become withered flowers and leaves. Later, the diseased leaves became thicker, petioles and internodes became shorter, leaves were deformed and plants were dwarfed. The causes of virus diseases are generally caused by improper planting environment and improper field management.
Prevention and control methods: standardize fertilization during the growth period of okra, and actively prevent drought and drainage; There is also drug prevention and treatment: the drug used is 20% virus AWP400 times solution spray, once every 6-7 days, continuous medication for 3-4 times can effectively prevent.
Rhizoctonia solani: Rhizoctonia solani, also known as "dead seedling", is characterized by brown spots on leaves in the early stage of the disease, and in severe cases, it will cause the plant to lodging and wither until death. Rhizoctonia solani is caused by heavy rain and long-term water accumulation in the field.
Prevention and control methods: when planting okra, ridge should be raised with a height of 20~30 cm. During the growing period of okra, intertillage weeding is needed to increase the light transmittance of soil. At the initial stage of the disease, 800 times of 38% azoxystrobin, 600 times of 4 1% carbendazim, 20% chlorpyrifos methyl EC 1200 times, or 800 times of 72.2% water can be sprayed every 7 ~ 10 days.
3. Aphidea: Aphidea is a plant-eating insect, including all members of Aphidea. At present, there are about 4400 species of aphids in 10 families, most of which belong to Aphidae. Aphids are also one of the most destructive pests on earth.
Yellow board trapping method: Choose a piece of cardboard or wooden board with a length of 20cm and a width of 15cm, stick yellow paper on it, and then spread a layer of butter on the yellow paper to make a trapping board, and hang the trapping board in the okra field, one for every ten squares. Using the yellowing of aphids, the aphids were glued to the trap board to kill aphids.
Drug control method: spraying the mixture of imidacloprid and pymetrozine once a week for 3~4 times continuously can effectively control aphids.
4. Ants: Ants are closely related to aphids, and the probability of ants appearing during the growth of okra is relatively high. Ants like to suck pollen from okra flowers, so every time okra blooms, it attracts a large group of ants. Before that, we should take protective measures.