草莓炭疽病的发生与防治

一、危害症状主要危害草莓的匍匐茎、叶柄、根冠、花及果实。幼苗发病：症状主要表现在叶片上。植株逐渐萎蔫枯死,易误认为是枯萎病。茎部发病：病斑一般长3-7毫米,黑色,纺锤形或椭圆形,溃疡状,稍凹陷。切开枯死病株基部或根部观察,从外侧向内部变褐,但维管束并不变色。叶柄或匍匐茎发病：病斑呈梭形,病斑包围叶柄或茎1周时,病斑以上部分枯死。

棚育辣椒炭疽病的发生规律及防治技术

辣椒炭疽病在江苏省射阳县发生比较普遍,不论长角椒或菜椒均染此病,在个别年份损失较大,特别是贮运期损失更大。此病常和高温灼烧病一起发生。在当地棚育辣椒上普遍发生的炭疽病为黑色炭疽病,红色炭疽病有零星发生。

塔城设施草莓主要病害及防治

塔城市春季气温回升快且不稳定,夏季短促且炎热,冬季漫长,草莓大多采取大棚种植。而大棚种植的草莓,很容易受到病害的侵袭。采取综合措施防治草莓病害,是塔城市草莓种植的一个重大课题。一、白粉病1.发病症状本病主要危害叶片,其次是花、花梗、果实及叶柄。该病典型症状是产生白粉状霉菌,叶片受害,叶面长出白色菌丝层,叶缘逐渐向上卷起,呈汤匙状;花蕾受害,花瓣呈紫红色并变小,不能开花或开花不全。

Infestation of Micromycetes on the Flowers and Seeds of Rhododendron sp.

The study of micromycetes infestation on flower buds, flower petals and seeds from 10 taxa of Rhododendron sp. was conducted during 2010-2012. Mycological analysis was comprised of 1,500 specimens of buds and petals and 500 seeds of Rhododendron sp.. It was shown that the necrosis and dieback of buds were caused by complex micromycetes （43 species）, with dominants Pestalotiopsis sydowiana, Alternaria alternata, Truncatella truncata and Epicoccum nigrum. Watery brown spots on the flower petals, resulting in the dieback of flowers, were caused by 38 species, including the most common P. sydowiana, A. alternata and Trichoderma viride. The seeds were contaminated by 18 species, and in addition to the above, the following species were associated： Oidiodendron tennuissimum, Davidiella macrocarpa and Phoma leveillei. The results of the mycological analysis confirmed the diversity spectrum of micromycetes species that inhabit the infested Rhododendron buds, flowers and seeds. The research revealed which taxa attracted the largest number of colonies and species of fungi.