Abstract
(1) Eucryptorrhynchus scrobiculatus Motschulsky (Coleoptera: Curculionidae: Cryptorrhychinae) is a major quarantine forest pest in China. It often co-occurs with E. brandti (Coleoptera: Curculionidae: Cryptorrhychinae) on a single host Ailanthus altissima (Mill.) Swingle (tree of heaven). (2) In this study, to explain the coexistence of the two weevils on a single host, we investigated the oviposition behavior of E. scrobiculatus and oviposition sites of E. scrobiculatus and E. brandti under afield and laboratory conditions. (3) The characteristic behaviors of E. scrobiculatus females prior to oviposition included searching, locating, excavation, turning, locating the oviposition cavity, egg deposition, and hiding. (4) The oviposition sites used by E. scrobiculatus and E. brandti differed. Eucryptorrhynchus scrobiculatus females laid eggs in the soil near A. altissima and compound leaf petioles, while E. brandti females laid eggs in A. altissima trunks. The eggs in compound leaf petioles did not hatch in the field. (5) Eucryptorrhynchus scrobiculatus and E. brandti utilized different oviposition sites and these differences in habitat use may reduce the competition for resources between species during the larval period, thus facilitating their coexistence on A. altissima.
Highlights
Ailanthus altissima (Mill.) Swingle (Sapindales: Simaroubaceae), called tree of heaven, is a species native to China and North Vietnam [1,2]
The results show that E. scrobiculatus spent more time on locating the oviposition of E. brandti [18], we compared the percentages of time spent on some behaviors oviposition sites (F = 21.223, p < 0.001), and depositing and hiding eggs (F = 56.053, p < 0.001), but E
We found that E. scrobiculatus females by petioles, and rarely in trunks (F = 26.212, p < 0.001); E. brandti females laid eggs mainly in tree lay eggs in the trunk bolts in laboratory oviposition tests, they only lay eggs in the phloem of the trunks and rarely in soil and petioles (F = 29.072, p < 0.001)
Summary
Ailanthus altissima (Mill.) Swingle (Sapindales: Simaroubaceae), called tree of heaven, is a species native to China and North Vietnam [1,2]. In China, it is widely distributed in 22 provinces It is an important tree species in urban industrial and mining areas, because of its strong adaptability, low requirement for soil and high resistance to smoke and sulfur dioxide [3]. Qiantouchun in China [8,9] This weevil is native to China and is distributed in most areas where its host is found [10,11,12,13]. Larvae of E. scrobiculatus bore and feed on roots of A. altissima. It has one generation per year in China, with larval and adult overwintering [14,15]. E. scrobiculatus is found with its close relative E. brandti (Harold)
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