रेशमकीटों में मस्कार्डीन (Muscardine) रोग के कारण, लक्षण तथा नियंत्रण उपायों का वर्णन कीजिए।
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शहतूत के किसी भी दो मृदा-जनित (Soil-borne) रोगों की पहचान कीजिए तथा उनके कारण, लक्षण और उपयुक्त प्रबंधन उपायों पर चर्चा कीजिए।
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