中国口岸首次截获攻击茶蜗牛研究

广东南海出入境检验检疫局从三山口岸西班牙进境金琥(Echinocactus grusonii Hildm.)中截获1种活的软体动物,经鉴定为攻击茶蜗牛[Theba impugnata(Mousson,1857)],该物种在中国没有分布记录,是进境植物检疫性有害生物名录中比萨茶蜗牛[Theba pisana(Müller,1774)]的近似种,也是世界自然保护联盟(IUCN)评估为易危级列入"红名单"的物种,为中国口岸首次截获。本文记述了其分类地位、鉴定特征、种群现状、地理分布、生物学和检疫方法,并讨论了易危物种和检疫性有害生物的关系。     

Synthesis and molluscicidal structure-activity relationships of some novel 1,2,4-triazole N-methyl carbamates

A new series of 1,2,4-triazole derivatives and their corresponding carbamates have been synthesized and screened for their molluscicidal activity against two types of terrestrial snail, Helix aspersa and Theba pisana, by two methods of application, either as contact or as bran baits. Several of the tested compounds exhibited good molluscicidal activity, and T pisana was more sensitive than H aspersa. Substitution at the o- and/or p-positions of the phenyl ring with chlorine or bromine gave higher molluscicidal activity than the unsubstituted compound, with o,p-dichloro substitution being optimum. In addition, compounds containing two triazole moieties showed higher molluscicidal activity, particularly as stomach poisons, than the contact toxic effect of the corresponding compound with one triazole ring. In general, carbamate derivatives were more active than their corresponding 1,2,4-triazole derivatives.     

Synthesis and structure–activity relationships for anticipated molluscicidal activity of some 2-amino-5-substituted pyridine derivatives

A series of 2-amino-5-substituted pyridine derivatives was synthesized and their molluscicidal activity against white garden, Theba pisana (Müller), and brown garden, Helix aspersa (Müller), snails was investigated by two methods of application. Some of these compounds showed strong activity under laboratory conditions against the two types of snail. T pisana was more sensitive to the tested compounds than H aspersa. The most effective compounds were 2-amino-5-(benzotriazole-1-ylmethyl)-3-methylpyridine, 2-amino-5-[1-(benzotriazole-1-yl)nonyl]-3-methylpyridine and 2-[(1,2,4-triazole-1-ylmethyl)amino]-3-methylpyridine which exhibited high molluscicidal activity. The toxicity results are discussed in relation to the chemical structures. © 1999 Society of Chemical Industry