Question

A citrus orchardist notices that a previously healthy canopy develops decline associated with a phloem-limited pathogen transmitted by a sap-sucking insect. Which disease-vector combination is most appropriate?

A Apple scab — aphid
B Citrus greening — psyllid
C Mango malformation — whitefly
D Banana bunchy top — beetle
E Grape downy mildew — thrips
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RBI Grade B 2026 Phase 1 Memory Based Paper
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