Lily pests and diseases occur in many species, but the main impact on the lily harvest is lily blight, gray mold, leaf blight, virus disease, root rot, aphids, tigers, earthworms, etc., of which the most serious damage It is lily blight and lily gray mold.
Principles of pest control: Prevention-based, comprehensive prevention and control. The greatest threat to lily production is lily blight and gray mold. In particular, lily blight, we must start from the rotation, seed selection, disinfection and other aspects to do a good job of prevention, mainly to agricultural control. When the Lily wilt disease just knifed: When it began to show symptoms, it immediately used the right-handed drug knife: exhibition control, control effectiveness was only 70-80%, plus it was the April-May rainy season, and it was unfavorable to carry out the medicament. Prevention and control, so do preventive work in the pollution-free cultivation technology is extremely important. At the same time, high-efficiency, low-toxic, low-residue pesticides should also be selected and used in accordance with the safety intervals of pesticides.
1. Fusarium wilt
It is a fungal soil-borne disease caused by infection with Fusarium oxysporum and Fusarium solani. The frequency and pathogenicity of Fusarium oxysporum are the main pathogens.
The process of the wilt disease is as follows: the initial bottom leaf turns yellow, the stem tip becomes light purple, and the curve is slightly curved; then the leaves at the bottom of the diseased plant are yellow or withered to a quarter to half, and the upper part of the stem turns purple and curved; Above, the upper part of the stem is severely curved; finally the entire plant exhibits symptoms, the whole plant withers, and the bulbs turn brown and rot.
Control methods: When Lilium wilt is just beginning to show symptoms, immediately use green hen No. 1 5 grams of water to 10-15 kg or 5% of mycorrhizal water solution 300 times, or 50% of methorus wettable powder 400 times , Or 60% Chlorotoxifen WP 500 times, should be 200-250 ml per irrigating solution, not too little nor too much. Perfusion is continued once every 5-7 days, depending on the severity of illness and continued 2-4 times.
2, gray mold
It is a common disease in the cultivation and production of lilies. It mainly damages the leaves and also infects stems, flowers, etc. The first round or oval lesions appear on the leaves. The sizes are different, the surroundings are reddish-brown, the interior is grayish, and the pathogens are damaging. The site (surface) is dense with gray moldy layer and spreads through wind and rain and airflow. It usually begins in April-May, and it quickly spreads in high temperature and high humidity weather. Appropriate environmental conditions for the growth of pathogens: Hi and humid, temperature is 20-25°C, pathogenic bacteria live in the affected area.
Control method: 1:1:100 Bordeaux mixture can be used, or 86.2% copper master or 53.8% can kill 1000 times liquid spray, spraying once every 7-10 days, spraying 2-3 times in succession Pharmacy should be used alternately and the spray should be even and thorough.
3, leaf blight
Lily cultivation is also a common disease. The initial symptoms of the disease are the appearance of reddish-brown spots on the leaves. The spot develops into an oval shape. The lesion becomes yellow-brown in the middle of the lesion and spreads severely to the entire leaf. The necrotic area is in wet weather. A yellow halo can be formed, and lesions on old leaves of A. radula sometimes appear as yellow markings.
Control methods: At the beginning of the disease, 1:1:100 Bordeaux fluid or 65% 600 mg of dexamethasone or 50% carbendazim was used.
4, virus disease
Symptoms are most common in leaves. Generally, the leaves are narrowed and slanted. Irregular round spots appear on the front of the leaves, and the leaves are dense. The diseased plants are obviously short and small, the buds are deformed, the color is faded, and the damaged bulbs become smaller.
Control methods: spray in addition to worms, can be used with 10-20 grams of happy gladiators or killers to kill 10-20 grams, or net 20 grams again, or plop 20-30 grams of 40 kg of water evenly spray.
Root rot
Initially, the lower leaves of the plant died, and then developed upwards, causing the death of the upper leaves and even the stems. Symptoms are light brown roots, and some roots are rotten. In severe cases, the whole bulb rots. When the bulb rots, the stem roots are rotted.
Control methods: In the early stage of disease, 50% dexamethasone 200 solution or 70% chlorothalonil 500x solution can be used to irrigate the root, 200 liters per strain, and 2-3 times every 7-10 days.
6, locusts
It mainly damages the young leaves and stalks of lily. Especially when the leaves are unfolded, the worms parasitize on the leaves and absorb the sap, causing lily plants to shrink, poor growth, and malformed buds. At the same time, they spread the virus and cause plants to feel sick.
The prevention and treatment methods are the same as those for preventing and treating viral diseases.
7, other pests
Mainly underground tigers, foraging seedlings (stems), ants, cockroaches, nematodes, etc. damage the underground bulbs and bulbs, causing root rot dead seedlings.
Control methods: 1 Before planting, 30-50 kg of lime shall be sprinkled in the acre of the planting ditch (hole). 2 Weeds must be removed before planting. The use of farmyard fertilizer must be fully decomposed. 3 Use dry tea or a small amount of tung to the root of the bulb. 4 Use 500-600 times of dichlorvos to water the roots to prevent warts and ground tigers.
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