玉米粗缩病的发生与病毒侵染时玉米植株的生育期关系密切。
Occurrence of rough dwarf disease of maize closely associated with growth stage of maize during the disease infection.
玉米粗缩病毒和水稻黑条矮缩病毒均可由灰飞虱传播并侵染玉米使其发生粗缩病。
Maize rough dwarf virus(MRDV)and rice black-streaked dwarf virus(RBSDV)which transmitted by Laodelphex striatellus Fallen are reported as the pathogens of maize rough dwarf disease(MRDD).
粗粒土具有明显的剪胀剪缩性，为非虎克材料。
Coarse-grained soils exhibit evident dilatancy, and they do not obey the Hook's law.
粗粒土具有明显的剪胀剪缩性，为非虎克材料。
Coarse-grained soils exhibit evident dilatancy, and they do not obey the Hook's law.
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