Identification and treatment of poplar pests and diseases

Poplar black spot disease, also known as poplar brown spot disease, can infect a variety of poplars, seedlings, saplings, and large trees can be susceptible to disease, affecting the normal growth of trees and causing economic losses.

Symptoms: It usually occurs on the young shoots and ears of the leaves, spreading from top to bottom, mainly to damage the leaves. At the beginning of the disease, there is a small spot on the back of the leaves with needle-like depressions. The posterior lesions are enlarged to about 1 mm, black. A little bulge, brown spots appear on the front of the leaves. After 5-6 days, the small spots of milky white protrusions appear in the center of the lesions (leaf and back), that is, the spores of the pathogens, and the lesions expand into large spots. In a round shape, when the disease is serious, the whole leaf becomes black, and the diseased leaves can be shed early for 2 months. When the seedlings are young, if all the leaves die, it is easy to cause the plant to die. If the seedlings are sick when they are unearthed, the leaflets and the seedlings will All turned black and the disease was not twisted.

The law of onset: the pathogen is overwintered in the diseased plaque of the deciduous or shoot shoots. The disease begins to occur at the beginning of May, and is the most prosperous in summer and autumn. Until the leaves fall, it can damage the leaves, petioles, ears, young shoots, etc. of poplars. An angular, nearly circular, or irregular dark brown lesion is formed, about 1 mm in diameter, and up to 5 mm in diameter. When the lesion is long, it can be connected into irregular large patches, causing early leaves. In the next year, the conidia newly produced by the pathogens spread by wind, landed on the leaves of seedlings, invaded into the leaves by stomata, and appeared in 3 to 4 days. The conidia disk was formed in 5 to 6 days for re-dip.

Comprehensive prevention and treatment methods: 1 strengthen nursery management. Disease-resistant varieties should be selected for seedlings, attention and time seedlings should be improved, ventilation and light transmission conditions should be improved, field management such as drainage should be done well, and disease conditions should be reduced. Nursery should avoid continuous cropping or avoid setting nursery near susceptible plants, and can be changed in a planned manner.茬 seedlings, seed bacteria need to be chemically treated to prevent the onset of seedlings, dry seeds can be treated with 85% chlorothalonil WP 1000-1500 times or with methyl thiophanate and multi-fruit powder. 2 Reasonable close planting and time cutting to maintain ventilation and light transmission in the forest. Clean the leaves in the forest in time to reduce the source of the disease. 3 During the onset, nursery and Chenglin are sprayed with 200 times Bordeaux mixture or 85% mancozeb 250 times solution. When spraying in the rainy season, 0.3% gelatin (or soy flour juice, soy milk) should be added to the syrup to prevent it from being washed by water. It should be cleaned and treated at any time to treat diseased leaves, fallen leaves, and eliminate pathogenic bacteria. It can also spray 40% carbendazim 800 times solution or 25% chlorothalonil 600 to 800 times solution, or 0.3% urea and phosphate II in early June. Prevention and treatment of potassium hydroxide mixture.

Keychains

Kang Jin Company offers one of a kind, unique designs,Personalized Custom Chain and Embroidery Keychain fully embroidered fabric key chain that features a double-sided design, heavy duty fabric and a chrome plated key ring, thick, high quality Metal Keychain and eyelets come installed with every tag, made from a heavy duty fabric, and the key chain has all of its edges stitched to prevent fraying, Engraved Keychain inclunding many of colors, large size and double-sided designs, 

Key Tags is a very strong, whether your keys whip in the wind or rattle with your pipes, you won't have to worry about damaging your awesome new Leather Keychains, and it easily to take from your pocket with it, seen on a far away counter or hook in your house or noticed in a backpack or purse in low lighting.

Keychains

Custom Chain,Metal Keychain,Embroidery Keychain,Engraved Keychain,Key Tags,Keychains,Leather Keychain

Kang Jin Apparel Co., Ltd. , http://www.classicsbags.com