A In which rust diseases leaf blades, sheath, glumes and awns are infected. A - Brown Rust B Optimum and maximum temperature for yellow rust infection is..15-20. C - Mosaic in sugarcane transmitted by........... Virus Causal organism of downy mildew in mustard .................. Peronospora parasiti Causal organism of grey mould........ Botrytis cineria SECTION-B 2 A Write the symptom of loose smut and ergot of wheat. A - Loose smut and ergot are two distinct diseases affecting wheat, each caused by different pathogens and exhibiting unique symptoms. ### Loose Smut of Wheat **Pathogen:** *Ustilago tritici* **Symptoms:** 1. **Early Appearance:** Symptoms are noticeable at the time of heading. 2. **Smutty Spikes:** Infected spikes (ears) emerge from the boot earlier than healthy ones. The entire spike, including the grains, is replaced by a black, powdery mass of smut spores. 3. **Powdery Mass:** The black spores are easily dispersed by wind, leaving only the bare rachis (central
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