What are the common pests of azaleas? How to prevent and cure?
Common pests of azaleas are red spiders, military insects, aphids, short beard cochlea and so on. Red spiders are small in size, but they do serious harm to azaleas. Cuckoos raised in high-rise buildings are most prone to this kind of pest.
The method of prevention and control is to hunt and kill manually. Medicine can be used to kill insects with 5 degrees of stone sulfur mixture, or you can use walnut leaves, Yangzhu peach leaves, green poles and other parts to soak out the juice, dilute it with water and sprinkle it with ll, and it is also a good way to spray and kill with 1000 dichlorvos solution.
The adult body of the military worm is small and flat, about 4 mm long and black. It is the most serious pest to the evergreen rhododendron. It often sucks leaf juice behind the leaves, and yellow and white spots appear on the leaves of the injured area, causing the leaves to fall off, causing the tree to weaken and affecting growth and flowering. This insect is easy to occur in rhododendrons in greenhouses.
The main method of prevention and treatment is to spray and kill with medicine. It can be sprayed with 1000 times of 90% trichlorfon or 1500 times of 40% omethoate EC or 1000-1500 times of fenitrothion emulsion.
Aphids mainly harm the young branches and leaves of rhododendron, light ones can make the leaves lose green, heavy ones make the leaves curl, become hard and brittle, can not absorb nutrients and affect flowering.
The control method is to pay special attention to the aphids during the overwintering period. after wintering, you can spray a 5-degree stone sulfur mixture on the plant to eliminate the overwintering eggs, shovel the weeds near the flowers and eliminate the insect source. In the aphid danger period, 40% dimethoate or omethoate plus 1200 times water solution for continuous spraying, 3-4 times can be effective.
Scutellaria is one of the most important pests of rhododendron. It often sucks juice near the main vein on the back of the leaf, which forms many oil-stained fields on the back of the leaf, and finally causes the leaf to fall off. The insect is Obovate, about 0.3 mm long, flattened, red, dark red, wood red, irregular black spots on the back and irregular black patches on the side. This insect is most common when it is hot and dry in summer, and then decreases when the rainfall is long.
Control methods spray Baume 0.5 degree stone sulfur mixture once in mid-late October and early spring March respectively to spray 25% insecticidal water swelling agent 500 times the effect is also good.
- Prev
Cultivation techniques of Rhododendron
Rhododendron is one of the ten famous flowers, which has the laudatory name of "western beauty in flowers". It has many species, luxuriant flowers and luxuriant leaves, and is mainly distributed in the southwest provinces, which can be divided into four categories: rhododendron, eastern rhododendron, summer rhododendron and western rhododendron. The western cuckoo is the most beautiful flower among the cultivated types. In recent years, with the rise of the flower industry, rhododendron has also been widely cultivated in the north. Its cultivation techniques are introduced as follows: first, propagation techniques: cutting propagation and tender branch propagation. Cutting propagation is the most widely used propagation method in rhododendron cultivation.
- Next
What are the common diseases of rhododendron? How to prevent and cure?
The main diseases of rhododendron are root rot, brown spot, black spot, leaf blight, iron deficiency chlorosis and so on. After the rhododendron suffered from root arm disease, the growth was weak, the leaves wilted and withered, the surface of the root system appeared water-stained brown fields, serious soft rot, gradually rotted and peeled, and the xylem blackened. The disease is most likely to occur in an environment with high temperature and high humidity. The prevention and control method is to strictly disinfect Pei 10 soil before turning the basin, and keep the soil condition sulfur loose, moist, make it have good permeability, and avoid stagnant water. If the plant is found to be sick, it should be dealt with in time.
Related
- Fuxing push coffee new agricultural production and marketing class: lack of small-scale processing plants
- Jujube rice field leisure farm deep ploughing Yilan for five years to create a space for organic food and play
- Nongyu Farm-A trial of organic papaya for brave women with advanced technology
- Four points for attention in the prevention and control of diseases and insect pests of edible fungi
- How to add nutrient solution to Edible Fungi
- Is there any good way to control edible fungus mites?
- Open Inoculation Technology of Edible Fungi
- Is there any clever way to use fertilizer for edible fungus in winter?
- What agents are used to kill the pathogens of edible fungi in the mushroom shed?
- Rapid drying of Edible Fungi