ibps-so 2016 · Question 366 of 394

A citrus nursery nanced by the branch has been placed under notice by the State horticulture department. The seedlings in the beds carry small raised spots on the leaves with a water-soaked margin and a pale halo, the spots later becoming at and scabby; the trouble spreads rapidly in the closely spaced beds after overhead sprinkling, and the department's laboratory has isolated a bacterium from the lesions and has identi ed the disease as bacterial spot of citrus. The eld o cer must name the organism correctly in the note recording the loss of stock, since the nursery has been directed to destroy the a ected beds, to give up overhead sprinkling and to switch to copper sprays, and the insurance claim on the nursery stock turns on the identi cation. The causal organism of bacterial spot of citrus is

1. APhytophthora citrophthora
2. BAlternaria citri
3. CPenicillium digitatum
4. DCandidatus Liberibacter asiaticus
5. EXanthomonas campestris pv. citrumeloCorrect