Citrus Plant Disease Management Quiz

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