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荞麦(Buckwheat)属蓼科(Polygonaceae)荞麦属(Fagopyrum),是一种粮药兼用的杂粮作物[1]. 近年来,随着对荞麦关注度的升高、国家扶持力度的增大,荞麦的种植面积逐年扩大,病虫害的问题也逐渐增加. 2016年首次在贵州省贵阳市乌当区百宜镇荞麦上发现黑唇平背叶蜂,而后随着种植面积扩大,发现其在贵州省荞麦主产区上均有分布[2].
黑唇平背叶蜂Allantus luctifer (F. Smith),又称黑翅叶蜂或黑唇十脉叶蜂,属于膜翅目(Hymenoptera)叶蜂科(Tenthredinidae)叶蜂属(Tenthredo),主要危害蓼科蓼属植物[3],幼虫最喜食荞麦和棉毛叶蓼[4]. 其幼虫以咀嚼式口器取食植物叶片,造成植物缺刻,严重时取食整个植物的茎和花,造成光合速率降低,植物减产. 目前关于黑唇平背叶蜂的生物学研究较少,且贵州省作为荞麦的主要生产大省,对其研究也基本为零.
为了保护生态系统,生物防治已经成为一种有效的替代化学防治的新农业害虫防治措施,生物防治主要分为天敌防治[5-6]和微生物制剂防治[7]. 利用昆虫病原真菌(Entomopathogenic fungi,EPF)调节自然害虫种群,已成为以生物防治为主导的综合治理重要途径之一[8]. 虫草属(Cordyceps)属于子囊菌纲(Sordariomycetes)肉座菌目(Hypocreales)虫草科(Cordycipitaceae)[9],是重要的昆虫病原真菌属之一,该属在我国目前共报道约120种,在自然界中可以持续存在控制靶标害虫[10],在生物防治中发挥着重要的作用[11-12]. 其中,环链虫草(Cordyceps cateniannulata),又称环链拟青霉(Paecilomyces cateniannulatu)或环链棒束孢(Isaria cateniannulata);玫烟色虫草(Cordyceps fumosorosea),又称为玫烟色棒束孢(Isaria fumosorosea);粉棒束孢(Isaria farinosa),又称为粉拟青霉(Paecilomyces farinosus),是重要的昆虫病原真菌,在自然界中广泛分布,可以寄生感染多种害虫. 目前研究发现环链虫草对鳞翅目[13-14]、蜱螨目[15-16]、半翅目[17]等,玫烟色虫草对鞘翅目[18]、鳞翅目[19]、半翅目[20-22]、双翅目[23]等,粉棒束孢对害虫、线虫和蜱螨类[24]等都有一定的防治效果,但对于蝙蝠蛾拟青霉(Paecilomyces hepiali),目前对其防治农业害虫的研究报道较少. 因此,测定虫生真菌对黑唇平背叶蜂幼虫的致病力,可为减少对环境有害的化学农药的使用、探究虫生真菌作为黑唇平背叶蜂生物防治剂的研发奠定基础.
因此,本文拟对黑唇平背叶蜂幼虫的形态特征、发育历期、生长规律、取食危害情况及虫生真菌致病力进行实验,以期为该害虫的预防、预测、预报及生物防治制剂研发奠定理论和实践基础.
Morphological of Allantus luctifer (F. Smith) Larvae, Characteristics of Damage to Buckwheat and Screening for High Insecticidal Fungi Strains
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摘要: 明确黑唇平背叶蜂Allantus luctifer (F. Smith)的生物学特征、对荞麦的危害情况及高毒力杀虫菌株, 为其预测预报及生物防治提供科学依据. 通过单头饲养观察, 研究其幼虫取食荞麦后的形态特征、发育历期、取食情况、危害特征及虫生真菌对其的致病力. 结果表明: 黑唇平背叶蜂幼虫划分为6个龄期, 1~6龄的发育历期分别为1.83±0.75 d, 2.10±0.84 d, 2.03±0.89 d, 2.17±0.95 d, 2.57±0.97 d, 4.63±1.50 d; 幼虫体长、体宽、取食危害情况都与龄期呈正相关, 体长、体宽在6龄前期达到最大值, 分别为14.21±1.50 mm, 2.25±0.26 mm, 蜕皮后进入蛹期; 幼虫的危害特征为1~2龄聚集取食, 叶片出现不规则且不穿透的孔洞, 3龄后食量增加且分散取食, 叶片出现不规则且穿透的孔洞, 6龄取食量最大, 为0.063 50±0.005 80 g/d; 环链虫草、蝙蝠蛾拟青霉在1×108个孢子/mL浓度下对黑唇平背叶蜂幼虫致死率较高, 为58.33%±2.89%, 71.67%±2.89%, 初步证明虫生真菌对黑唇平背叶蜂有一定的生防潜力, 有成为生物防治剂的可能性.Abstract: The biological characteristics of Allantus luctifer (F. Smith) and its damage to buckwheat were determined to provide a scientific basis for its prediction and integrated management. In this paper, the morphological characteristics, developmental duration, feeding conditions, and damage characteristics of A. luctifer were studied by single-raised observation. The results showed that the larval age of A. luctifer was divided into six stages, and its developmental duration from first to sixth instar was 1.83±0.75 d, 2.10±0.84 d, 2.03±0.89 d, 2.17±0.95 d, 2.57±0.97 d, and 4.63±1.50 d, respectively. The body length, body width, and feeding harm of larval were positively correlated with theinstar. At early sixth instar, the body length and width reached their maximum values (14.21±1.50 mm and 2.25±0.26 mm, respectively), then entered the pupal stage after molting. The harmful characteristics of the larvae were as follows: the first to second instar of larvae gathered for feeding, and irregular and non-penetrating holes appeared in the leaves. After the third age, the food intake increased and dispersed for feeding, and irregular and penetrating holes appeared in the leaves. The maximum feeding amount at the sixth age was 0.063 5±0.005 8 g/d. When A. luctifer was treated with Cordyceps cateniannulata, Paecilomyces hepiali suspension (1×108 spore/mL), the corrected mortalities were 58.33%±2.89%, 71.67%±2.89%. Entomopathogenic fungi have great potential for biocontrol of the larvae of A. luctifer and could be used as a biological control agent.
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表 1 供试虫生真菌菌株
文中代号 菌株拉丁名 菌株号 生境及寄主 1 Cordyceps fumosorosea 08LYS-1 安徽鳞翅目蛹 2 C. fumosorosea 08XS-3 云南鳞翅目蛹 3 Isariafarinosa 04XS-9 云南鳞翅目蛹 4 C. cateniannulata 08XS-1 云南鳞翅目蛹 5 Paecilomyces hepiali 04XS-5 云南鳞翅目蛹 -
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