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24 Cards in this Set

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Symptoms of the PRSV

Oily streaks on leaves


Clearing along veins -flecks


Mosaic and chlorosis


Distortion,stunting


Shoestring appearance -mite damage


Profuse molting and puckering of specially young leaves

This PRSV isolate from -induces systemic necrosis

Taiwan

Asian country near China

Papaya varieties tolerant to PRSV have been developed where?

Florida, Taiwan ,Hawaii

Prevention of PRSV through quarantine and geographical displacement of cropland has occurred where?

Hawaii, Brazil, Phillipines

Prevention techniques for PRSV

Disease free and clean seedlings


Roughing


Netting


Non host crop (e - corn )


Cross protection


Tolerant varieties


Induction of mild stain

Vectors of PRSV

Aphids (Aplus gossypii, Myzus persicae peach and melon aphid )


Seed transmission is rare


Which nutrient count of papaya decreases when the disease hits?

Papain

In how many weeks of infection does symptoms show?

2-3 weeks

Who named the disease ring spot?

Jensen -1949

Length of PRSV

760-800nm

Genus and species of PRSV

Potyvirus


Potyviridae

History of PRSV

1937-Hawaii islands


1950 -drop of 94%


Origin -India (2250 years ago )


Not found in Africa


Florida, Hawaii, Texas, Caribbean Islands, SA,southern China, BD,India, Thailand, Taiwan ,Phillipines -Severe

Amphitrichous

Flagella found on both sides of bacteria

Spirillum serpens

Atrichous

No flagella in bacteria

Petritrichous

Flagella surrounding the bacteria

Salmonella sp.

Lophotrichous

Duct of flagella found on one side

Pseudomonas

Prion

Infectious protein fibril

Virion

Infectious virus particle

Lipovirus

Virus with envelop

Ribovira

When nucleic acid of virus is RNA

Viroids

Infectious RNA in virus

Pilli

Fibrous structure of the outside of some gram negative bacteria

Peplomere

Unit of outer lipoprotein layer outside capsid of virus

What does Leeuwenhoek remind you of?

Father of bacteriology


Named bacteria animalcules


In 1675 discovered bacteria