Banana root nematode disease is the main disease of bananas, what are the characteristics of banana

Banana root-knot nematode disease is more common in banana growing areas in China, and often occurs at the same time as banana root-knot nematode disease. The symptoms of damage to the aboveground parts are not obvious at the beginning of the plant. When the damage is severe, the root system rots, the fruit does not ripen normally, the fingers become stiff, and the leaves turn yellow.

When the damage is severe, the plant withers and is easily damaged by the wind. The roots are rotten, and nematodes can be found in the rotten roots. As the number of nematodes increases, the disease becomes more and more severe.

The damaged roots are short, fat, and cracked. Vegetative roots are destroyed before they develop into large roots. Initially appears as small reddish-brown spots.

As the scar increases, the roots will split like a ring peel. After being eaten by nematodes, they become infected with fungi and bacteria, causing root rot. The leaf margins of the above-ground parts begin to dry up.

After the old leaves are budded, if they are scorched, they will wither from the edge to the midrib. After the root system of the seedlings is damaged, galls of different sizes are formed on the taproot and lateral roots, some with a diameter of more than 1 cm; Some are only about 2 mm in diameter. White particles can be seen when the gall is cut, and pear-shaped female nematodes can be seen under the microscope.

Severely infected roots are shorter than uninfected roots, with fewer lateral roots and root hairs, and are deformed by the destruction of the dredging tissue.

The transport of water and nutrients in the plant body is blocked, the normal physiological activities are disturbed, and the growth of the aboveground parts is weak. Most of the seriously ill plants died in the same year, and some died the following spring. Banana perforation nematode disease, also known as black root disease, is a quarantine disease that mainly affects the roots and fleshy stems of the underground part of bananas.

After the nematode invades from the surface of the banana root, it migrates from cortex cells to cells, feeding on nutrients in cortical cells, causing damaged cells to disintegrate and form cavities. At the beginning of infection, there are no obvious symptoms in the aerial parts, and reddish-brown sunken spots can be seen at the roots.

Longitudinal cracks appear at the root with slightly raised edges, which worsen as the disease progresses. The diseased root is weak, short, swollen or brown rot. The normal growth of the aerial parts is affected by the destruction of root tissue, resulting in the death of banana seedlings, the wilting of leaf margins, the wilting of heart leaves, the lack of fruits, and the finger-shaped fruits.

Severe panicle plants often lodge. Banana root-knot nematode disease is a type of kidney nematode that belongs to the genus Kidney Nematode. Hermaphrodites are free in the soil, and females are immature and have small worm-like bodies.

After heat killing, the body is curved towards the ventral surface, the head is round to conical, connected to the contour of the body, there are pinstripes, the head is moderately ossified, the mouth needle is moderately developed, and the base of the mouth needle is rounded.

The first point will grow a lot of black dots on it, which is very scary and scary, and the second point will grow a lot of big holes, so this situation should be noted, and the third point is that there will be a lot of bugs on it, so we must pay attention to it at this time.

Yellowing of leaves, lodging of adult plants, etc. Yellowing of leaves, where root nematodes eat on leaves, resulting in dullness and yellowing; Adult plants lodging and damage to the roots are unable to carry excessive fruit.

The symptoms of the aboveground part of the initial damage of the plant are not obvious, when the damage is serious, the root rot, the fruit can not mature normally, the fruit finger is dry and hard, the leaves are yellow, and the plant wilts and is easy to be broken by the wind. Root rot, where nematodes can be found. As the number of nematodes increases, the disease becomes more severe.

The large roots of the victim are short, fat, and cracked. Vegetative roots are destroyed before they develop into large roots. At first, it appears as small reddish-brown spots, but as the scar grows, the roots peel open like rings, and the nematodes are eaten by fungi and bacteria, resulting in root rot.

Leaf edges dry up begin to appear in the aboveground parts. Damaged at the budding stage, the old leaves are scorched, and they are withered from the edge to the midrib.

1.Leaf spot disease, scab disease: reasonable dense planting, reasonable bud retention, frequent garden cleaning, banana circles, destruction of diseased leaves, keep the garden clean, ventilated and ventilated, reduce disease ** and the chance of transmission; Increase the application of potassium fertilizer and organic fertilizer to improve the disease resistance of plants.

Chemical control: the growth season (4 October) every 20 days spraying, after the budding of the plant properly encrypted to about 15 days once, the current more effective agents are 25% dielectric demulsification 1500 times, Kairun 1500 times, Shigao 10% water dispersible granules 1000 times, Fuliku 25% water emulsion 1000 times, 80% mancozeb 800 times, 25% mycloconazole 1500 times, 25% difenoconazole 1500 times, amicida 1500 times, 40% 400 times of dicarb, 800 times of 70% methyl tobuzin, 1500 times of 30% emulsifiable concentrate of Aimiao, 1000 1200 times of liquid, as well as Sigao, Deserving, Wanxing, etc. When spraying, spray the foliar surface and leaf back, and add a small amount of detergent, laundry detergent or additives to increase the efficacy of the drug to strengthen the adhesion effect of the drug.

For leaf blast, the methods of promoting rapid seedling growth, ventilation and light transmission and combining chemical control can be adopted, compound fertilizer can be applied to improve the disease resistance of seedlings, reasonable ventilation, reduce temperature, strengthen light, and reduce the occurrence of diseases; For more serious seedlings, the seedling shed should be cleared to reduce the source of disease. Severely diseased banana orchards should be rotated or replanted.

2.Banana flower thrips, brown foot horn pectorals: spray insecticides before and during budding, such as Lesben 1000 times liquid, 10% imidachlorethim 2000 times liquid, 70% Emmelo 15000 times liquid, Aifuding EC 2000 3000 times liquid, 5% rotenone EC 1000 times, 1000 times chlorazide liquid, malathion 1000 times liquid.

Spray 1 or 2 more times in the middle of budding and budding. Foreign commercial banana plantations use special syringes to inject anti-thrips when the buds are exposed.