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The recurrence period of the disease is generally more in the hot and humid season, and there are also episodes in the winter in the greenhouse. Generally, the growth of weaker plants, young seedlings, lower leaves, poorly ventilated plants, and western oysters (compared with edgy) are more severe. According to the law of incidence, the following prevention measures can be taken:
(1) Strengthen the cultivation and management, the rhododendron cultivation basin should use rot and leaf soil, the watering pH should be between 4.5 and 6.5, the watering matrix should be dry and wet, and often it should be poured with some decomposed thin organic liquid fertilizer. Promotes robust plants, leaves hypertrophy increases resistance, pots should be placed in a ventilated place, summer shade, moisture, and water. Diseased leaves should be removed and burned in time, and attention should be paid to selection of disease-resistant varieties, and quarantine of plant diseases and pests should be strengthened.
(2) Chemical control: Spray 70% thiophanate WP 800 times or 50% carbendazim 300 times in time after flowering. In addition can be sprayed regularly to prevent the drug, a mixture of protective fungicides and fungicides can be used, such as Baolian plus M Dasheng 45 and can be killed alternately to achieve good results, or with 1:1: 150 Bordeaux mixture once a week Spray twice; enter the 1:1:100 Bordeaux mixture every 10 days during the rainy season and spray 3 to 4 times continuously.
Rhododendron japonicum rhododendron is a non-invasive disease, and it is also a common disease in the cultivation of rhododendron. After the disease occurs in the plant, the leaves become thin, chlorotic, and pale. Therefore, the disease is also called chlorotic disease. The new leaf has a lack of green. When the new leaf color becomes light and the leaf becomes yellow, the veins are still green. At this time, iron deficiency symptoms are generally diagnosed. This phenomenon occurs in alkaline soils and areas where alkaline water is used for watering. Photosynthesis can not be performed normally when the leaves are sick. When they are light, they affect the growth and development of the plants and their ornamental value. In severe cases, the plants will die.
Control measures: To strengthen the cultivation and management, combined with irrigation, watering ferrous sulfate solution, the leaf surface can be sprayed with 0.5% ferrous sulfate solution, the plant leaves can gradually restore the green.
Rhododendron red spider The adult female body is about 0.3 millimeters long, dark red, nearly elliptic, body dorsal uplift, 4 pairs of dark red; male adult body length 0.25 mm, wedge-shaped, flat bright red. In many generations a year, the adults overwinter in the roots of the plants, mainly in the vicinity of the main vein near the stalk of the abaxial leaves. From June to July, high temperatures, little rain, and dry weather breed rapidly. The number of occurrences is large and the damage is serious. Debris falls off.
Control methods: artificial control, often checked after April, found that when individual leaves have spider mites, pests and leaves can be burned in time. Conditional release of natural enemies such as ladybugs, grass bark, and thrips can be used for biological control. If more spiders with spider mites are found, chemical control can be carried out. For example, spraying 40% dicofol 800 to 1000 times has a strong killing effect on adults, nymphs, larvae and eggs, as long as the spraying uniformity is good.
Du Fu's network is a network of cuckoo cuckoos, also called Du Fujun with insects. The adult body is about 3.5 millimeters long, dark brown, covered with reticular wings on the wings must be slightly rectangular, stationary; dark brown stripes on the wings constitute "X" shape. Nymphs resemble adult worms. They are only small and unarmed, about 2 mm long, and 0.6 mm long. They are oval and milky white. They are produced at the midrib and larger veins. They appear pale green at the time of first birth and turn pale yellow later. Three to four generations a year occur. Adults spend winters in the bark and land gaps in the middle and late October, and begin activities in the second year from April to May. They feed on the back of the leaves. In July and August, the damage is severe. Nymphs and nymphs clustered around the main veins on the back of the leaves and sucked the sap from the leaves. Their secretions formed a large yellow-brown rust. When they were severe, the leaves were pale, causing early fall and affecting the growth and flowering of the azaleas.
Prevention methods: (1) After the winter, remove fallen leaves and weeds near the flower trees, bury them deeply or burn them, and eliminate overwintering adults. (2) Chemical control, after the occurrence of overwintering adults in the month of May and the first generation of nymphs, spraying 80% of dichlorvos EC or 50% of Locust emulsion 1000 times, spraying once every 7 to 10 days, and continuously spraying 2 to 3 times. Can also be used 3% carbofuran buried 5 grams per pot, the effect is also very good.
Rhododendrons and cockroaches mainly harm the roots. Sometimes the earthworms also harm the leaves. The medium used for cultivation must be sterilized at high temperatures to kill the eggs and find pests. It can be treated with carbofuran or iron methadone.
In the die casting process,higher specific pressure is required, so that higher filling speed can be obtained.which is beneficial for alloy to overcome mold filling resistance.and effectively fill each part of the cavity.The Casting General Tolerance is Grade GB-CT4.
Process Technology: High pressure die casting, Cold Chamber
Product Dimensions: Customized
Casting General Tolerance: Grade GB-CT4
Flow Processes: Die casting, Degating to remove the residual of the gate, Polishing and Deburring to remove the burrs, Polishing to remove the parting line, flash,CNC Turning, Cleaning, Packaging, Storaging, Shipping
Control Measure: Incoming Material Test, First Article inspection, Routing inspection, Final item inspection, and Outgoing quality control
Inspection Equipment: CMM, Caliper, Plug Gage, Screw Gauge
Application: Machinery Parts
Certificate: IATF16949:2016,ISO14001:2015,ISO45001:2018
Lead Time: 30-35 days
Trade Term: FOB Ningbo
Common Diseases, Insect Pests and Control of Rhododendron
Rhododendron black spot The black spot of azalea, also known as brown spot, is a common multiple leaf spot disease in azaleas. After the onset of disease, the leaves form dark spots and gradually dry off until the plants die. The disease mainly harms the leaves of azaleas. It is infested by the fungus of Cercospora grisea. Several bacteria brown spots begin to appear. With the continuous expansion of the small spots, the lesions are interconnected into pieces, resulting in brown-brown mycelium, and the affected leaves. Beginning from the petiole, the greenish brown-yellow leaves early and severely affects the growth, development and ornamental value of the azalea. The pathogens overwinter on the leaves or diseased plants and the spores spread with the wind.