WorksheetsCitrus Plant Disease Management Quiz
Total questions: 15
Worksheet time: 8mins
What causes foot rot, crown rot, and root rot in citrus plants?
Phytophthora nicotianae or P. palmivora
Bacterial infection
Viral infection
Fungal infection
What is a recommended practice for managing Phytophthora-induced diseases in citrus plants?
Use of chemical control methods only
Integration of chemical control methods and cultural practices
Avoiding irrigation
Planting in calcareous soils
Why should nursery stock be tested for Phytophthora spp. before planting?
To ensure the soil is fertile
To confirm the absence of citrus-specific P. nicotianae
To increase the growth rate of the plants
To reduce water usage
What is the relationship between Diaprepes abbreviatus larvae and Phytophthora spp.?
Larvae help reduce Phytophthora populations
Larvae increase the risk of root rot
Larvae have no effect on Phytophthora
Larvae prevent Phytophthora infection
What is the primary reason for increased reliance on fungicides in poorly drained soils?
To enhance nutrient uptake efficiency
To control root damage by Phytophthora spp.
To promote fibrous root regeneration
To increase water retention
Which factor is a key cause of the rapid development of damaging Phytophthora populations?
High soil pH
Constant availability of new root growth
Low water retention in soil
High levels of calcium
What is the effect of huanglongbing (HLB) on fibrous root growth?
It decreases fibrous root growth
It synchronizes root growth with flush events
It increases new growth of fibrous roots
It prevents root dieback
Why is it important to time chemical applications to protect major root flushes?
To enhance soil texture
To prevent nutrient loss
To control Phytophthora propagule counts
To increase water drainage
What is the recommended method of application for Aliette WDG for phytophthora control?
Foliar spray
Trunk paint or spray
Microsprinkler
No specific method
Which pesticide is recommended for use as a protectant and curative systemic for phytophthora?
Nonbearing
Phostrol
ProPhyt
Aliette WDG
What is the method of application for Ridomil Gold SL on nonbearing trees through irrigation?
Surface spray
Trunk injection
Soil drench
Irrigation injection
For bearing trees, how many times per year can trunk spray for gummosis be applied?
Once
Twice
Three times
Four times
What is the recommended method of application for Ultra Flourish on nonbearing plants?
Surface spray on weed-free area
Banded application under the canopy
Trunk spray
Soil drench
Which pesticide is used as a trunk paint for freeze protection?
Nonbearing
Bearing
Copper—Wettable Powder
Copper—Count-N
What is the rate of Copper—Wettable Powder application?
0.5 lb (metallic) Cu/1 gal water
1 qt in 3 qt water
4 fl oz/acre
3–4 fl oz/20 gal
