Bananas devastating disease-what will be the damage caused by bunching disease

Bananas devastating disease-what will be the damage caused by bunching disease? What prevention methods should be adopted?

Bananas are an indispensable fruit in the fruit market. Their market share can be ranked in the top five. There are even areas where bananas are the main food. Bananas are still the fourth largest food crop after rice, wheat and corn. Enough to see its importance.

So in the fruit market, what should be done if indispensable bananas encounter devastating diseases during production? Just like citrus huanglong disease and kiwi ulcer disease, large areas will be affected, and it will be contagious. How should we deal with such a situation? So today, the editor will introduce you to the devastating diseases of bananas and how to control them.

Scented coke bunching disease, also known as Congding disease, leading disease, commonly known as banana, scallion, etc., occurs in banana production areas in Guangdong, Guangxi, Fujian, Taiwan, Yunnan and other provinces, is one of the main diseases of bananas.

The incidence rate of orchards with severe incidence can be as high as 10% -30%, or even 50% -80%. The susceptible plants are dwarfed and cannot bloom and form buds. The susceptible plants only have small and small fruits with no commercial value at the current bud stage, causing great losses.
Bananas devastating disease. what will be the damage caused by bunching disease

Analyze the symptoms of banana bunchy top disease and find out the target

The most prominent symptom of banana bunchy top disease is that the new leaves are shorter and narrower than one, the leaves are hard and straight and grow together in bundles, and the diseased plants are short.

The old leaves of the diseased plant are more yellow than the old ones of the healthy plant, but the new leaves of the diseased plant are greener than the new ones of the healthy plant; the diseased leaf is brittle and easily broken; the veins show intermittent, thick green stripes of varying lengths, and some veins It is green and transparent in the early stage, and becomes black stripes in the later stage. The stripes are 1-10 mm long and 0.75 mm wide.

There are also thick green stripes on the petioles and false stems of banana diseased plants, commonly known as "green tendons". Dark green stripes are a characteristic of early disease diagnosis. There are many tillers in the diseased plant, and the roots are reddish brown and dull. Most of the roots rot or turn purple, without new roots.

The susceptible plants at the seedling stage are particularly short and cannot bloom and bear fruit. When the bud appears, the flower buds are not erect and not strong. At this time, the leaves are all aligned, and they do not show the "bundle top" symptom. The old leaves do not show yellow, but the veins of the most tender leaves still show thick green stripes. The susceptible after bud can be strong, but the fruit is small and small, the end of the fruit is as small as the finger, the flesh is crisp and unscented, and the fruit handle is elongated and curved.

Identify the infection method and host of banana bunchy top disease and pave the way for physical control

Banana bunchy top disease virus is mainly infected by poisonous tiller buds and banana cross vein aphids, but not by mechanical friction and soil infection.

Banana cross aphid (nymph) takes more than 17 hours to feed and feed, with a recurrence period of several hours to 48 hours, and a feed time of 15-2 hours for poison transmission. After that, it can maintain the ability of poison transmission for up to 13 days. The nymph transmission efficiency is higher than that of the adult, and the virus remains after the nymph peels. The poisonous aphid cannot transmit virus through the progeny, so it is generally believed that the mediator transmits the virus in a "persistent way".

Bundle top virus hosts are limited to sweet banana plants and abaca.

Recording the incidence of banana bunchy top disease, taking regular control methods with less effort

Bananas are perennial plants, mainly propagated by buds. After the plant becomes ill, not only the mother plant develops disease, but its buds also become infected.

Therefore, the primary infection source of this disease is mainly diseased plants and their tiller buds in the diseased area, and the diseased tiller buds in the new area and the disease-free area. After an initial infection source in an orchard or an area, The disease can be spread by banana aphid. Banana seedlings can become ill within 1-3 months of infection. Due to the constant transmission of banana cross-vein aphid, the orchards with an area of ​​13.3-20 hectares can reach a disease rate of 50% or even 80% within 4-5 years.

Analyze and select comprehensive prevention methods from various aspects, thoroughly remove hidden pathogens from shallow to deep, and return to a safe and green environment in the banana park
Diseases in banana plant and tree

1. Selection of disease-free banana seedlings (tiller buds) 

For disease-free areas or even newly-built banana gardens in diseased areas, strict selection of disease-free banana seedlings is the most important control measure. Due to the long incubation period of this disease (1-3 months), the mother plant should be carefully checked before digging the seedlings.

2. Digging out diseased plants 

In the diseased area, a comprehensive inspection is carried out every year during the disease occurrence season. If the diseased plants are found, spray aphid-killing agents immediately, and then completely dig out the roots and roots of the plantain and burn them collectively.

In order to overcome the troubles of digging out diseased plants and spraying aphids to treat aphids, capsules containing 50mg, 80% 2,4-D soluble powder can be put into the trumpet of the diseased plant, or water can be injected into the false stem, and the diseased plant will be released after 1 week Decayed to death.

Banana orchards with lighter disease conditions will remove diseased plants in winter. After half a month, the diseased areas will be sterilized with lime and then replanted. In the future, diseased plants should be controlled and removed in time, and good control results can be obtained.

Banana orchards with an incidence rate as high as 30% -50% or more, due to the greater chance of infection, after digging out the diseased plants, the replanted healthy seedlings may also become ill.
After the diseased plants are treated, other crops or more resistant disease-resistant plantains, pink plantains, and other varieties should be replanted in the short term, and bananas should be planted after the disease is eliminated.

3. Elimination of Media

Eliminate the media to eradicate the weeds parasitized by aphids near the banana garden, and spray the pesticide to control the cross-veined aphids when the spring garden is opened every year. 10% imidacloprid wettable powder can be used 3000-4000 times, and 50% can also be used to resist Aphidazole WP 2000 times liquid spray.

The introduction and prevention methods of banana bunchy top disease are as above. As one of the devastating diseases, banana farmer friends should attract the necessary attention and take corresponding prevention measures in time to minimize the loss. Any fruit trees, diseases and insect pests should adopt the concept of prevention in advance, supplemented by prevention in the later stage, in order to minimize the loss.

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