Control Of Viruses Flashcards
(17 cards)
Best control
Keep plant viruses out of regions
Virus introduced in new area by
Introduction of infected plant material
Introduction of viruliferous vector
Control
Need integrated approach
Look weak links- interventions
Virus control strategies
Vector control
Resistant cultivars
Eliminated/ reduce source virus
Modify env
Vectro control
Chemical: contact,systemic,non insecticide- oil
Biological- predators,parasitiods,mating disruption
Virus vectors
Fungi Nematodes Arthropods Arachnids- mites Parasitic plants
Chemical control
Insecticides
Acaricides
Fungucides
Nematicides
Contact insecticide
Application- converage
Need regularly done
Env damaging
Systemic insecticide
Only sap sucking insects
Env friendly
Longer effective duration
Insecticides
Apply alternating compounds
Different modes if action.orevent build up of rsistance
Vector to insecticide
Biological control of mealybugs parasite
Predator: cryptolaemus montrouzieri
Parasitoid mealy bug
Leptomastix dactylopii
Biological control
Effective for control of insect oest
Seldom reduce vector populations below threshold
No longer problem as vector
Noninsectcidal chemical- pheromones
Mating disruption
Pheromone from disoensers- false source
Male disorientated
Unable to detect plume of calling female
Virus control strategies
Remove volunteer plants Avoid overlapping plantings Rotation of non host Control weed hosts Healthy plantimg material Physical barriers to vectors Avoid vector peaks Mulching Intercropping Roguing
Traditional breeding
Introgression- backcrossing
Use genes within 1 species or several closely related species- sexually compatible
Many years- improved variety- esp no molecular marker
Resistant cultivars
Transgenic: forgein gene- bacillus thuriensis
Selection breeding: tovirus/vector
