ibps-so 2016 · Question 358 of 394

A mango orchard nanced by the branch has lost the greater part of its crop at the owering stage. The panicles, the young fruits and the tender leaves carry a white powdery growth; the a ected owers dry and drop before setting, and the marble-sized fruits that have set fall in large numbers. The trouble followed a spell of cloudy weather with cool nights and heavy dew during owering, and it is worst in the crowded interior of the unpruned trees. The plant protection adviser has prescribed three sprays of wettable sulphur beginning at panicle emergence, and the eld o cer has to name the causal organism correctly in the crop loss note, since another fungus of the same crop produces a black super cial growth on the leaves and is sometimes confused with this one. The causal organism of powdery mildew of mango is

1. AMeliola mangiferae
2. BOidium mangiferaeCorrect
3. CAlternaria alternata
4. DBotryodiplodia theobromae
5. EFusarium moniliforme