一、番茄早疫病1、症状：苗期和成株期均感染此病，苗期除可在基部叶片产生病斑外，还能危害地下根颈部和初生根。病斑黑褐色后腐烂，严重缢缩变细。成株期除感染根颈外，主要感染地上部分的叶片、叶柄、茎枝和果实。叶片上初为黑褐色小斑点，后扩 First, tomato early blight 1, Symptoms: seedling and adult stage are infected with the disease, seedling except in the base leaves produce lesions, but also endanger the root and neck roots and primary roots. Spot after dark brown rot, serious shrinking narrow. In addition to infected adult roots in addition to the root neck, the main infection of the aerial parts of the leaves, petioles, stems and fruits. Leaves early dark brown small spots, after expansion