The latest control methods of cabbage diseases and insect pests

Cabbage, also known as cabbage, is a common market in life, planting a wide range, and in the process of cabbage planting pests seriously affect its growth and yield. What are the pests of cabbage? How to prevent it? Let's get to know each other.

1. Black rot

It mainly damages leaves and leaf balls. The diseased cotyledons will form water-stained spots at seedling stage, and then gradually spread to true leaves. Black spots or thin black strips appear on the veins of true leaves, and V-shaped spots appear on the leaf edges. More than half of the lower leaves of the adult plant began to develop disease, forming leaf spots or yellow veins. The leaf spots had leaf edges that expanded inward and expanded necrosis. The pathogen spread to the base of the stem to form black reticular veins, resulting in plant withering and death.

Control methods: before sowing with warm water soaking half an hour, take out after cooling sowing or germination sowing, or with 50% of 200 times solution of methamine soaking for 15 minutes, washing and drying sowing. Rational rotation, rational fertilization, avoid partial application of nitrogen fertilizer, disease is sprayed bordeaux mixture, chlorothalonil, streptomycin control, the effect is better.

2. Soft rot

It usually occurs after the cabbage is rolled, the stem base and the cabbage heart are soaked and soft, and then the plant is withered, and the outer leaves are withered and shed, so that the leaf bulb is exposed.

Control method: Deep turn soil layer 18- 20cm before planting. Pay attention to drainage in rainy season, not flood irrigation, cloudy days and noon should not be watered, to rotate with onion and garlic crops. Discovered diseased plants should be pulled out in time, the diseased points should be disinfected with lime, or they can be sprayed with ammonium bromide, streptomycin or chloramphenicol. When spraying, attention should be paid to spraying petioles and rhizomes close to the ground.

3. Black spot disease

It mainly damages leaves, irregular water-soaked or oil-stained spots appear after damaging leaves, and then gradually turn light brown or black brown.

Control method: rotate with non-cruciferous crops for more than 2 years, disinfect seeds before sowing, spray streptomycin, chloramphenicol and neophytin at the initial stage of disease, 7-10 days apart, 2-3 times in succession, the effect is better.

4. Pieris rapae

Also known as cabbage white butterfly, white butterfly, larvae called cabbage caterpillar, mainly larvae harm, serious when the leaves nibble clean.

Control methods: larvae harm, start spraying pesticides, commonly used chemicals are chrysanthemum kill EC, chrysanthemum horse EC, control effect is better, but pay attention to the alternate use of chemicals, so as not to cause drug resistance.

The above is an introduction to cabbage pest control methods, I hope to help you, want to know more about the relevant knowledge, please pay attention to us.