In high-rainfall areas, a disease known as Phytophthora blight is perhaps the most important disease affecting papaya. It is caused by a fungus-like organism and occurs most severely during periods of windy, wet weather. When it affects fruits, it may initially be mistaken for another disease, powdery mildew, due to the mass of whit.

There are number of diseases that cause severe loss to papaya cultivation. Some of them are Damping off, Ring spot, Food Rot, Leaf Curl and Papaya Mosaic. These are considered to be the most important and significant diseases that causes severe loss to the papaya growers.

Papaya leaf curl disease: Papaya leaf curl virus Symptoms - Severe curling, crinkling results in distortion of the leaves accompanied by vein clearing and reduction in leaf size. Leaves with dark greenish thick veins get curled downwards and inwards. Leaves become leathery and brittle with inter-veinal areas raised leading to rugosity of the leaf.

2021年1月18日 · Papaya leaf curl virus is transmitted through the vector whitefly (Bemisia tabaci). Leaf curl virus infects the plants at the seedling stage and at the apical meristem. The only remedy of the disease plant is the removal, burning and destruction. The spread of the disease can be checked by controlling whiteflies’ population.

PDF | On Feb 8, 2022, B.K. Prajapati and others published Important Diseases of Papaya (Carica Papaya L.) and Their Management | Find, read and cite all the research you need on ResearchGate

In many papaya growing countries of the world, Phytophthora is a major constraint to the long-term viability and productivity of the industry. The diseases caused by this pathogen include damping-off of seedlings, root rot, stem-rot and fruit rot.

2007年5月8日 · Ascochyta leaf spot, or leaf blight is a disease that can cause losses of approximately 217 30% in yield, as observed in some orchards of the northern region of Espírito Santo,

Leaf Curl of Papaya : The disease is transmitted by the vector white fly (Bemisia tabaci). Severe curling, crinkling and deformation of the leaves characterize the disease. Mostly the young leaves are affected. Apart from curling the leaves also exhibit vein clearing and thickening of the veins. Sometimes the petioles are twisted.

The leaves are reduced in size and show blister like patches of dark-green tissue, alternating with yellowish-green lamina. The leaf petiole is reduced in length and the top leaves assume an upright position. Infected plants show a marked reduction in growth. Fruits borne on diseased plants develop water soaked lesions with a central solid spot.

It first appears as small, discoloured lesions, irregularly scattered on the leaves. These spots become irregular in shape, then increase in size and appear brown to grey in colour. A light yellow zone surrounds the spots. Several lesions coalesce to cover large areas of the leaf and in severe infections the whole leaf may die.