With the development of national medicine and rural economy, the area of planting patchouli is expanding, but the pests and diseases that harm patchouli are more and more, which have a greater impact on production. In order to protect the development of patchouli production, its main pests and diseases control methods are introduced as follows.
(a) the main diseases
1?Angular spot disease: this disease is harmful to the leaves, often occurring in the hot and humid season, the beginning of the water-soaked spots, and later gradually expanded to polygonal brown spots, severe leaf drying and shedding, resulting in a reduction in yield.
Prevention methods: spray 1:1.5:120 times Bordeaux solution at the beginning of the disease, every 7 to 10 days, 2 to 3 times.
2?Root rot: the disease occurs in the summer rainy season, harming the roots, and even the whole plant. Infected plants in the root and rhizome rot, gradually extended to the ground, so that the cortex turned brown, and finally withered and died.
Prevention methods: found that the diseased plants should be pulled out in a timely manner and centralized burned to prevent the spread of the disease, and then sprinkled into the diseased holes on the lime disinfection, and do a good job of drainage, and do not even crop.
3?Blight: this disease occurs in mid-June to early July, initially the diseased plant leaves and leaf tips drooping, green blight, and finally root rot, the whole plant withered, seriously affecting the yield.
Prevention methods: (1) patchouli harvest, remove the diseased residual plants, centralized burning to eliminate overwintering pathogens. (2) Combined with spraying foliar spraying of potassium dihydrogen phosphate, can improve plant resistance. (3)Spraying 50% carbendazim 800 to 1000 times liquid or 50% tolbutazin 1000 to 1500 times liquid at the early stage of the disease, spraying every 7 days, spraying 2 to 3 times.
(2) the main pests
1?Aphids: adults and worms cluster in the shoots and young leaves, so that the plant grows poorly, and can not normally grow new shoots and new leaves. Aphids can be sprayed with 40% Rogaine emulsion 1500 to 2000 times.
2?Red spider: the insect mainly sucks the plant nutrition, affecting the growth, can be sprayed with 40% of Lego emulsion 1500-2000 times liquid.
3?The silver-striped night moth: the insect often occurs in May to October, to larvae bite leaves, affecting photosynthesis, available 90% trichlorfon 1000 times liquid spray.
4 leaf borer: harm to the leaves, to the larvae in the young shoots, young leaves on the spitting roll leaves, hiding in which to eat the leaves, available trichlorfon 300 to 400 times liquid spray.
5?Ground tigers, mole crickets, crickets, etc.: pests bite off seedlings, resulting in a lack of seedlings, affecting the yield, available trichlorfon made into poisonous bait bait or artificially captured.
You take a look at it and then prescribe the right medicine. I hope it can help you