种内竞争
象鼻虫
生物
凯罗蒙
单萜
幼虫
绿叶挥发物
芳樟醇
香叶醇
信息素
尼禄
植物
动物
寄主(生物学)
生态学
食草动物
精油
作者
Panjing Liu,Xiaofang Zhang,Rongyan Wang,Shulong Chen,Tao Zhang
摘要
Abstract BACKGROUND Intraspecific competition is shared in the insect world, especially under the condition of limited food and space resources. To avoid intraspecific competition and increase offspring survival, insects have evolved various effective strategies. A widely‐accepted tactic is employing chemical cues, which are frequently utilized as indicators of conspecific colonization. The sweet potato weevil (SPW), Cylas formicarius , is a destructive pest of sweet potatoes. Its larvae bore into sweet potatoes and alter the emission of odors. The present study aimed to investigate whether volatiles associated with SPW larvae feeding influence the behavioral preference of conspecific adults. RESULTS Volatiles from SPW larvae‐infested sweet potatoes were collected by a head‐space method and analyzed using gas chromatography‐electroantennogram detector (GC‐EAD) and gas chromatography–mass spectrometry (GC–MS). Five compounds eliciting EAD responses from the antennae of both male and female adult SPW were identified from sweet potatoes with the third‐instar larvae, including linalool, citronellol, nerol, geraniol, and ipomeamarone. Four monoterpene alcohols significantly repelled SPW adults from feeding and oviposition at higher doses in the behavioral preference bioassays. Among them, geraniol displayed the strongest repellent activities for SPW feeding and oviposition. These results suggested that SPW larvae could reduce colonization of adult SPWs by inducing monoterpene alcohols, thereby avoiding intraspecific competition. CONCLUSION The present study demonstrated that volatile monoterpene alcohols induced by SPW larvae are chemical cues of larvae occupation for SPW adults to change their behavioral preference. Unveiling factors that mediate avoidance of intraspecific competition could help develop repellents or oviposition deterrents for SPW control. © 2023 Society of Chemical Industry.
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