A.5~10℃B.15~25℃C.25~30℃D.30~40℃
A.枝葉變黃、枯萎、干基樹(shù)皮腐爛開(kāi)裂、剝落B.針葉樹(shù)干基處常有大量樹(shù)脂凝結(jié)成塊C.病樹(shù)根部的邊材和心材呈海綿狀腐朽D.枝干叢生,葉片變小、皺縮
A.變成花序B.冬前死亡C.葉片變大D.節(jié)間變長(zhǎng)