تنوع گونه ای سرخرطومی های جنس (Col.: Curculionidae)¬Larinus روی گیاهان میزبان Astreaceae در منطقه کرمان

Abstract

During the growing seasons of 2009 and 2010, same tomato fields throughout Marvdasht were visited and 96 isolates of <em>Fusarium </em>spp. were collected from root, crown and stem of diseased tomato plants. Isolates were identified as based on morphological characteristics. They were divided into four species namely: <em>Fusarium solani</em>, <em>F. pseudoanthophilum</em>, <em>F. oxysporum</em> and <em>F. equiseti</em>. These species, being highly pathogenic to tomato, accounted for 47.9%, 18.7%, 22.9% and 10.4% of the isolates, respectively. Of these species, <em>F. solani</em> and <em>F. pseudoanthophilum</em> are the first time reports of on the disase tomato from Iran. The most frequently encountered species were <em>F. solani</em> and <em>F. oxysporum</em> with 46 and 22 isolates, respectively. Pathogenicity test was conducted for all the species of Fusarium on tomato seedlings by the methods of root dip and soil inoculation and as based upon completely randomized design. Data were analyzed through SAS and mean comparison done through LSD test. Results indicated that all the species of Fusarium except <em>F. pseudoanthophilum</em> caused wilt, chlorosis and root rot in tomato host plants. The results indicated isolates of <em>Fusarium</em> spp. To be significantly different in the disease severity at 1% probability. Host range study with <em>F. oxysporum</em> revealed that the pathogen caused wilt and chlorosis only on tomato and was identified as <em>F. oxysporum</em> f. sp. <em>lycopersici</em>. Thid was while, <em>F. solani</em> caused root rot in tomato, chickpea, <em>Arachis hypogea</em> and <em>Amaranthus retroflexus</em>. <br /> <br />