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Viral Diseases in Banana Next Major Viral Diseases in Banana End Kootaivazhai in Poovan Bract Mosaic Bunchy Top Streak Previous Next Kootaivazhai Symptoms in poovan In Tamil Nadu, the banana cv. Poovan is characterized by conical and ill filled fruits with prominent central core having many under developed non viable seed structure rendering the fruits inedible. Reasons Insufficient growth hormones (Auxin) for the redevelopment of fruit and hence the fruits are forced to produced seeds . End Previous Next Management practices This disorder can be overcome by spaying 2, 4D 20 ppm when the last hand of bunch is opened. The same chemical at same dose stage result in increased bunch weight and uniform grade especially in cvs. Nendran and monthan. End Previous Next Bract Mosaic Virus Banana bract mosic virus (BBrMV,) - locally known as kokkan. Symptom develops in primarily transmitted through infected suckers. Transmission Primary: Infected Sucker Secondary: mealy bugs End Previous Next Symptoms Yellow streaks on leaves. Splitting of the pseudo stem. Abnormal emergence of the bunch from the middle of the pseudo stem. Produce fewer fruits of smaller size. Dark reddish-brown mosaic symptoms, which are especially obvious in bracts. Spindle-shaped chlorotic streaks running parallel to the veins. Distinctive dark colored mosaic patterns, stripes or spindle-shaped streaks are visible. End Previous Next Green or reddish-brown(depending on cultivar) streaks or spindle shaped lesions on the petioles and a tendency towards a congested leaf arrangement. Management Practices: Transmission by mealy bugs. Requires early detection, and immediate eradication of infected plants. Effective control of the disease, similar to that of other viral diseases. virus-free propagating materials should be planted. End Previous Next Bunchy Top Symptoms The presence of dark-green spots on the petioles, midribs, and leaf veins of the newly emerging leaves. The infected leaves are erect, narrow, stunted, and often have yellow leaf margins. The leaves become smaller as the disease progresses. End Previous Next Eventually, the crown of the plant is composed of only stunted leaves, producing a "bunchy top", hence the name. The infected plant does not produce any fruit or the bunch does not emerge from the pseudo stem. End Previous Next Mode of Spread Banana aphids (Pentalonia nigronevosa) Infected planting materials Volunteer plants that serve as alternate hosts like Bird of paradise, Ginger, and Wild ban Weeds End Previous Next Management Practices Using diseased-free planting materials controlling of aphids, using soapy water or insecticidal soap. Spray the Plants thoroughly, importantly on petioles, furled leaves, whorls, or on young sucker removing and rouging of infected banana plants. Chop, dry, and bury the infected plants. Control vector by spraying methyl demoton 1 ml/l. or Monocrotophos, 2 ml/l. or Phosphomidon 1 ml / lit. or Injection of Monocrotophos 1 ml / plant (1 ml diluted in 4 ml). Infected plants are destroyed using 4ml of 2, 4, D (50g in 400 ml of water). End Previous Next Banana Streak Virus Banana streak virus (BSV) is an important disease of Musa and affecting the productivity of both bananas and plantains. Reported in nearly all countries where this crop is grown including Mauritius, India and many countries of the African continent. Symptoms Disease severity is very variable, and probably depends on environmental conditions, as well as on host and virus (Cont).. genotypes. End Previous Next The most characteristic foliar symptoms of infection chlorotic streaks, are which become necrotic with time. The leaf lamina may also be narrower, thicker and become torn. End Previous Next Stunting of the plant, constriction of the bunch on emergence (choking), altered phyllotaxis (leaves arranged in a single vertical plane instead of the normal spiral pattern), and detachment and splitting of the outer leaf sheaths of the pseudo stem. End Previous Next Management Practices The eradication of infected plants. The use of BSV-free planting materials. BSV can be carried in in-vitro plantlets, as it is not eliminated by shoot-tip culture. Virus particles can only be detected in areas of leaf tissue with symptoms. Parts of leaves with pronounced symptoms should be used for serological indexing. End Previous Next To sum up: Viral diseases are mostly transmitted through vectors. It affect the quality and vigour of the plant. Kottavazhai in banana – ill filled development of fruits with unviable seedy structure it can be overcome by application of 2, 4 – D 20ppm at the last hand of bunch opened. Banana bract mosaic – This disease transmitted through aphids it caused symptom of dark reddish brown mosaic it may be avoided using free propagating materials. Bunchy top – Stunted growth of plant with bunchy appearance. This disease transmitted through aphids. The disease controlled application of monocrotophos 2 ml/ lit. Banana streak virus - Chlorotic spots on leaf lamina. Use virus free planting material. End Previous