中江县1988年首次发现辣椒疫病(Phytophthora SP.),1990年以来严重流行,重病田块80%以上植株枯死.造成重大经济损失.1 症状辣椒根、茎、叶和果实均可受害,以茎和根受害为主.根部受害后,表皮呈水浸状,暗褐色、脱落,仅剩中柱部分,失去吸收功能,植株萎蔫,表现为青枯症状.茎部先从地表部或枝条开始发病,形成褐色斑点,逐渐扩大,绕茎一周致使病部以上萎蔫,并相继干枯死亡.叶片和果实发病后呈暗褐色坏死,病果软腐,内腔有浓密的白色气生菌丝。果柄染病,则可导致大量落果.在湿度大时,植株病斑表面可见稀疏浅白色霉层.2 病原经观察.菌丝体无隔,孢子囊梗无分枝,顶端产生孢子囊,与菌丝无明显差异.孢子囊卵圆形或圆形,顶 Zhongjian County was the first to find Phytophthora sp. In 1988 and it has been a serious epidemic since 1990. More than 80% of the plants in seriously ill fields are withered, resulting in serious economic loss.1 Symptoms The roots, stems, leaves and fruits of pepper can all be affected by stems, And roots of the main victims after the root damage, the epidermis was flooded, dark brown, off, leaving only part of the column, the loss of absorption, plant wilting, manifested as wilt symptoms stem beginning from the surface or branches began to disease , The formation of brown spots, gradually expanding around the stem so that the disease caused wilt above, and have died in succession. Leaf and fruit after the onset of dark brown necrosis, soft-rot disease, lumen dense white aerial mycelium. Fruit stalk infection, can lead to a large number of fruit drop.In the humidity, the surface of the plant lesions can be seen sparse superficial white mildew.2 The pathogen was observed mycelium without septa, sporocyst no branches, the top of the sporangia, and No significant difference in mycelium Sporangium oval or round, top