1 chili dead tree
By PingBa county in guizhou Lin card, denon a few chili advocate the villages and towns such as investigation and further disease identification, to determine the local pepper dead tree mainly disease tree wither and die dead tree, tree root rot, 4 kinds of bacterial wilt die.
1.1 disease dead tree
Is a fungal disease, by pepper Phytophthora (Phytophthora capsici), accounting for about 45% of the dead tree.In following the results of the heavier disease (total early and early crabapple), especially in the water the water or rain when the weather clears and hot disease, quickly after 1 weeks can cause the whole piece of hot pepper to full of water, the main risk in the earth's surface above the base of rhizome, stem and fruit branch branch.onset of the plant stem base and stem branch branch office disease healthy boundaries visible, teething with particular disease spot, late disease spot become dark brown, cortex softening decay, stem atrophy, strain leaf wilting die.Fruit suffer disease spot by fruit stalk place to spread the fruit, fruit is water, boiled, humidity is bigger, the surface layer with white mildew, peel fruit with dense white velvet shape hyphae, dry fruit is frozen fruit hanging on the branches.General continuous cropping, horizontal bedding cultivation, large density, poor ventilation pervious to light, field water block heavy disease, with big pepper, hot pepper, chili on line.
1.2 wilt die
Is a fungal disease, by Fusarium oxysporum (Fusarium oxysporum f. sp., capsicum), accounting for about 30% of the dead trees, plants wither and local wilting.Plants wither, it is early root water immersion, the posterior roots become dark brown, until the whole of brown water, its root ministry skin is easy to fall off;Local wilting, branches and leaves on the early show with particular shape, after folding prolapse until dry, when air humidity is big, have white mildew disease department.The disease from seedlings to colonize into plant all can come on stage, in general from the onset to wither 15 days or so, continuous cropping, damp ShuiJiaoTian, after the rain water to heavy.
1.3 root rot dead tree
Is a fungal disease caused by a variety of sickle bacteria, accounting for about 15% of the dead tree.Generally started wilting after GuaGuo, taproot brown lesions occur, root bark is easy to peel, make JiaoGuo not mature properly, began to strain leaf wilting during the day, the evening to restore the next morning, after many days the whole plants die again and again.Root rot has the characteristics of long course, the hard to find, once found it was too late, so early prevention is very important.Generally high temperature, high humidity is conducive to the occurrence and spread of the disease, even ready to glue, low-lying land, land heavy disease.
1.4 bacterial wilt die
Bacterial diseases, by the green away false form bacillus (PseudomoNas solanacearum Smith), accounting for about 10% of the dead tree, general plant more incidence of period.The early onset of individual leaf wilting during the day, night back to normal, gradually developed to the entire plant wilting, repeated 3 ~ 5 days leaves become withered and died, leaf color is green don't fall off.Stem appearance symptom is not obvious, symptoms occur in the root tip, causing vascular bundles brown, transverse section is visible after moisturizing milk white mucus overflow, different from blight.General partial acid, low-lying, continuous cropping soil, pests occur on land, are conducive to the disease.Bacterial wilt not only spread fast, and short duration, strain die quickly, once popular, often devastating disasters.
2 the prevention and control technology research
Chili dead tree except caused by infectious disease more than the original, all kinds of natural disasters can also cause pepper dead tree, in the actual production, and seedling cataplexy and withered dead tree.Because of the above four dead tree to PingBa county pepper pepper production often yield or failures, according to the observation and practice for many years, following the prevention and control technology is put forward.
