Key diseases focus on control - pepper chapter
Dead trees is the "first harm"
For the planting of hot (sweet) pepper farmers, the problem of dead pepper farmers very headache, especially for more than 3 years of continuous greenhouse, because of dead trees lead to yield reduction or extinction in a few. Through years of planting vegetable farmers concluded that the early planting is an important period to prevent dead trees, in this key point to prevent dead trees, than the fruit irrigation to prevent dead trees effect is much better, the cost is lower than 50%, the loss is also much smaller.
Through the interview, I learned that the cause of dead pepper trees have a variety of causes, in addition to fertilizer more burned roots, water macerated roots, seedling disease, stem rot, root rot are the main cause of dead trees, these diseases are collectively referred to as soil-borne diseases. In production, there is a single disease occurrence, there is a compound disease occurrence, of which the root rot caused by dead trees. Pepper root rot disease has a variety of, now the greenhouse pepper is in the results of the period, but many farmers reflect the recent pepper dead serious, some greenhouses even 2/3 of the plants appear dead, and is the more watering development more powerful. Reporter in a number of pepper sheds to observe and talk with farmers that the main disease causing dead trees for Fusarium rot and mildew root rot.
Fusarium root rot mainly in the roots of peppers, will be pulled out of the plant can be found, the root layer of peppers become light brown to dark brown rotten, chaff-like, and very easy to peel, revealing the xylem darkened, and mainly through the water spread. The pepper is wilted in the daytime and recovered in the evening to the next morning, and the pepper dies after a few days of repetition.
The drug program: available 50% chlorobromoethyl cyanuric acid soluble powder 1000 times, mixed with 3% malaria - methomyl 800 times for root irrigation. At the same time in the watering to the disease plant isolated, to prevent the disease from infecting other plants.
Pepper epidemic root rot is mainly spread by water, but it can infect the base of the stem of pepper plants, resulting in water-soaked rot constricted at the base of the pepper, the disease becomes dark brown or black; after the plant is pulled out, you can find that the roots of the disease is also water-soaked rot, and mainly affect the adult pepper plants. For the onset of death of the plant dug out, wrapped in plastic bags to take it out of the shed to avoid the spread of large areas
Medication program: Epidemic root rot is mainly oomycete, vegetable farmers can use 58% gold Radomil 500 times mixed with 72.2% Priligy 600 times, or with 50% enoylmorpholine.
It is important to note that when watering, do not let the water flowing through the diseased plants to the normal plants, which can easily infect other healthy plants, resulting in a large area of dead trees in the shed. At the same time to remind farmers in the pepper planting should be cavity application of biological fertilizer (such as radical antibacterial 968), because the more beneficial biological bacteria in the soil, the more reproduction, will not increase with time and affect the use of the effect.
Chili pepper leaf drop more often
Chili pepper infected with disease and lead to a large number of leaf drop, serious when the whole plant leaves off into bald branches, no leaves are unable to photosynthesis, the plant eventually decay and die, resulting in serious yield reduction. Recently, the reporter in Shouguang City, Jitai Town, chili pepper shed area visits, many farmers reflect the above-mentioned situation, due to the inability to correctly identify the disease, resulting in the wrong medicine, control effect is poor. To this end, the reporter summed up the common cause of chili severe defoliation of four kinds of diseases, vegetable farmers can refer to friends.
1. Pepper leaf blight. The biggest feature of the disease is the development from the bottom up, the spot gray-white, the middle of a perforation, the late onset of a hand shaking the bottom of the stalk, the leaves "clatter" fall, into "light pole commander". To prevent and treat the disease, it is recommended to spray 10% of phenotrimethoxazole 1500 times + 20% of thiamethoxam copper 600 times, or 20% of crown green (mimosine + copper turpentine) 800 times.
2. Pepper bacterial leaf spot disease. The disease occurs more often in recent times, mainly in the upper leaves. The initial leaf yellow-green water-soaked dots, late spots become rust-colored, and because of the loss of leaf flesh only the epidermis and appear thin and brittle. The disease in the high temperature and high humidity environment is developing quickly, the late fall serious, Shandong Province, Qingzhou area vegetable farmers commonly known as the disease "bacterial yellow tips". Prevention and treatment when sprayed with 2% of the collection of rice (Chunleiomycin) 600 times + 72% of the agricultural streptomycin 4000 times, or 20% of the leaf blight 1000 times, or 33.5% of the net fruit essence (quinoline copper) 750 times.
3. Pepper powdery mildew. Powdery mildew is relatively easy to identify, the onset of white powder spots on the leaves, the late development of large powder spots, covering the entire leaf, resulting in serious plant defoliation. Prevention and treatment of the disease can be sprayed with 25% of ethacrynic acid 1000 times, or 30% of the aqueous solution of ethacrynic acid 1000-1500 times.
4. Pepper white star disease. The identification point of the disease is the leaf spots on the sub-circular, white dots, looks like scattered white stars, the late onset of the disease caused a lot of leaf drop. Prevention and treatment of the disease can be sprayed with 12% copper pine tar emulsion 500 times, or 14% copper complex aqueous 300 times.
Pepper rotten stalks are more common
In recent years, the pepper planting process, the most worrying vegetable farmers is the winter temperature is low when the phenomenon of rotten stems and dead trees. At the beginning of the disease, generally in the main stem in the lower part of the fork side of the spot, brown rot, if not timely control will quickly around the stem a week, and finally the plant stem inside the rot will also occur dead, seriously affecting the economic benefits of farmers.
This phenomenon is mainly caused by three diseases: one is the epidemic, then is the mycobacterium, and there is a bacterial soft rot. These three diseases can be distinguished by the following symptoms: pepper epidemic disease at the beginning of the disease for water-soaked spots, and then appear around the epidermis to expand brown or black-brown stripes, the disease above the branches and leaves gradually withered, high field humidity, the disease produced white mold layer, with a slight odor; mycobacterium at first into a watery light brown spots, then brown, quickly around the stem a week, and then expand up and down, high humidity, the surface of the disease is born with White cotton-like mycelium, after the stem cortex mold, no odor, dry gray-white; bacterial soft rot at first watery dark green spots, then brown soft rot, with a foul odor.
In the past few years, Master Zhang also figured out an effective way to prevent and control the phenomenon of rotten stalks and dead trees, mainly to the plant "surgery". The disease occurs in the early stages, as long as the rot does not reach half a circle, it can be saved by this method, the success rate can reach almost 90%. The specific method is to remove the rotten part of the plant with a razor blade, and then use a mixture of fruiting spirit and methyl tropicin, DT, etc. to dissolve into a glue and apply it to the removed part. The diseased part must be cleaned up, the coated stem will produce a tumor, but will not affect the normal growth of the plant. Master Zhang said that every year in this season, he has to lie in the shed for four or five days in a row to find the rotten place for "surgery" processing. In the plant "surgery" at the same time, but also the whole shed to spray the prevention and control of these diseases, kill the disease to prevent its continued spread of damage. If you can tell what kind of disease it is, you can treat it according to the type of disease, so I won't go into details here; if you can't tell what kind of disease it is, you can use chlorothalonil or pyrimethanil with mesophil or chlortetracycline to control it.
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