This ppt has a wide range of knowledge about transmission of viruses and also having description about vectors or mode of spreading of viruses. It gives you information about shape, size, types and life cycle of a vector.

1. FUNDAMENTALS OF PLANT PATHOLOGY
Submitted To:-
Dr. Waseem
Assistant professor
SAES , SUG
Submitted By:-
Mr. Aryan Kohli
B.Sc.(Hons) agriculture
Session- 2019-20

2. TRANSMISSION OF
VIRUSES BY VECTORS IN
PLANTS

4. FORMS OF TRANSMISSION OF VIRUSES BY VECTORS
1. INSECT TRANSMISSION 2. MITE TRANSMISSION
3. NEMATODE TRANSMISSION 4. FUNGUS TRANSMISSION

5. 1. INSECT TRANSMISSION
• Insect which chew or suck plant tissues are the ideal and
most common.
• Means of transmitting viruses to new hosts in the field.
• The most important virus vectors are aphids, leafhoppers,
whiteflies, and thrips.

6. TRANSMISSION OF VIRUS BY INSECT

7. 2. MITE TRANSMISSION
• Mites of the family Eriophyidae transmit at least 6
viruses including Wheat streak mosaic virus.
• Only 1 Tetranychidae and 5 eriophid mites have been
proved to be the vectors of plant viruses.
• It also appears to be a nonspecific or casual vector of
potato virus Y.

8. TRANSMISSION OF VIRUSES BY MITES

9. 3. NEMATODE TRANSMISSION
• Nematode plant viruses are transmitted by three genera of soil
inhabiting.
• Ectoparasitic nematodes e.g. The genera Longidours,
Paralongidorus and Xiphinema.
• Transm several viruses such as grape fanleaf, tobacco ring spot
and other viruses.

10. TRANSMISSION OF VIRUSES BY NEMATODES

11. 4. FUNGUS TRANSMISSION
• Root-infecting fungal-like organisms, the Plasmodiophoromycetes
Polymyxa sp.
• And Spongospora sp. And the Chytridiomycetes Olipidium sp., transmit at
least 30 plant viruses.
• Teakle 1960: TNV transmitted by fungus Olipidium brassicae.
• Barley yellow mosaic virus: Transmitted by the plasmodiophorid fungus
Polymyxa graminis (Kusabaet al., 1971;Adams, 1990a), which is an
obligate root parasite.

12. TRANSMISSION OF VIRUSES BY FUNGUS