What disease in plants causes a mosaic pattern of discolouration?

The tobacco mosaic virus infects tobacco and lots of other closely related species like tomatoes and peppers. It is transmitted by contact between plants, either naturally or on the hands of farmers. It infects the chloroplasts of plant leaves and changes their colour from green to yellow or white in a mosaic pattern.

What is mosaic disease in plant?

A mosaic virus is any virus that causes infected plant foliage to have a mottled appearance. Such viruses come from a variety of unrelated lineages and consequently there is no taxon that unites all mosaic viruses.

What causes mosaic disease?

Mosaic symptoms may be masked or latent, especially at temperatures above 27 °C (81 °F), and are sometimes confused with nutrient deficiency or herbicide injury. The causal viruses are spread by aphids and other insects, mites, fungi, nematodes, and contact; pollen and seeds can carry the infection as well.

What type of pathogen causes tobacco mosaic in plants?

Tobacco mosaic virus (TMV) is a positive-sense single-stranded RNA virus species in the genus Tobamovirus that infects a wide range of plants, especially tobacco and other members of the family Solanaceae.

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What is Mosaic leaf pattern?

Definition of leaf mosaic

1 : the arrangement of foliage in most plants (as in the common ivy) in such a pattern as to expose the maximum number of leaves to the direct rays of the sun with little loss of intervening space.

What kind of disease is chlorosis yellowing of leaves?

When we say “chlorosis,” we’re generally talking about iron deficiency, a nutrient deficiency that causes leaves to yellow in a particular way.

What causes wilt disease?

Wilt symptoms are caused in a large number of broadleaf plants by several species of Fusarium and Verticillium fungi. The fungi differ one from another but the symptoms which they cause are very similar.

What causes rose mosaic?

Hosts: Rose mosaic is a disease of roses caused by Prunus Necrotic Ringspot Virus (PNRSV) and Apple Mosaic Virus (ApMV). These two common viruses are found worldwide and are known to cause serious diseases in stone fruits and apples. These viruses, separately and together, have been found in rose bushes.

What is anthracnose fungus?

Anthracnose is a common fungal disease of shade trees that results in leaf spots, cupping or curling of leaves and early leaf drop. In Minnesota, anthracnose is most common in cool, wet spring weather. Anthracnose is not a significant threat to the health of the tree and doesn’t require treatment in most cases.

What does mosaic virus look like?

What Are Mosaic Viruses? Mosaic viruses affect more than 150 types of plants, including many fruits, vegetables, and flowers. The disease is characterized by leaves that are mottled with yellow, white, and light or dark green spots and streaks (in other words, a “mosaic” of these colors).

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Which virus causes discoloration of plant leaves?

The tobacco mosaic virus infects tobacco and lots of other closely related species like tomatoes and peppers. It is transmitted by contact between plants, either naturally or on the hands of farmers. It infects the chloroplasts of plant leaves and changes their colour from green to yellow or white in a mosaic pattern.

What causes disease in plants?

Infectious plant diseases are caused by living (biotic) agents, or pathogens. These pathogens can be spread from an infected plant or plant debris to a healthy plant. Microorganisms that cause plant diseases include nematodes, fungi, bacteria, and mycoplasmas.

What type of virus is tobacco mosaic virus?

TMV is a single-stranded RNA virus that commonly infects Solanaceous plants, which is a plant family that includes many species such as petunias, tomatoes and tobacco.

Is chlorosis a disease?

chlorosis, symptom of plant disease in which normally green tissue is pale, yellow, or bleached.

What is leaf mottling?

Mottle is a pattern of irregular marks, spots, streaks, blotches or patches of different shades or colours. It is commonly used to describe the surface of plants or the skin of animals. In plants, mottling usually consists of yellowish spots on plants, and is usually a sign of disease or malnutrition.

Which crop is generally affected by mosaic disease *?

Mosaic viruses affect a wide range of edible crops – alfalfa, apples, beans, celery, corn, cucumbers, figs, peppers, spinach, tobacco and tomatoes are some of the more common ones. They can also infect ornamental plants like abultilon, delphinium, gladiola, marigold, petunia and one of the most notable, roses.

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