Effects of leaf quality and microhabitat on the survival of a leaf-rolling weevil (Attelabidae)

Female Cycnotrachelus roelofsi (Coleoptera: Attelabidae) construct two types of leaf roll, i.e., cut-off cradles (CCs) and suspended cradles (SCs), in which to lay eggs; these cradles are generally constructed using older and younger leaves, respectively. We conducted two experiments to determine whether the quality of cradle leaves affects egg and larval survival. In the first experiment, we severed all SCs from a tree and placed them on the ground with unmanipulated CCs in the early breeding season. In the second experiment, we resuspended all CCs in a tree with unmanipulated SCs in the late breeding season. We also compared leaf mass per area (LMA), polyphenol content, and nitrogen content between the two cradle types to determine whether there were any differences in leaf quality. Larval mortality, probably caused by cradle herbivory, was significantly greater in severed SCs than in intact CCs in the early season, suggesting that leaf quality had a profound effect on larval mortality in the terrestrial microhabitat. In contrast, larval mortality did not differ between resuspended CCs and intact SCs in the late season, suggesting that leaf quality had little effect on larval mortality in the arboreal microhabitat. LMA was higher in CCs than in SCs, but there were no differences in the nitrogen and polyphenol contents. These results suggest that cradles constructed using mature, tough leaves were more effective against terrestrial cradle herbivores than those constructed using new, soft leaves.     

中国茸卷象属研究（鞘翅目：卷象科）

本文共记述中国茸卷象属Ｅｕｓｃｅｌｏｐｈｉｌｕｓ Ｖｏｓｓ７种,其中包括２新种：皱胸茸卷象Ｅｕｓｃｅｌｏｐｈｉｌｕｓ ｒｕｇｕｌｏｓｕｓ ｓｐ．ｎｏｖ．、齿腿茸卷象Ｅｕｓｃｅｌｏｐｈｉｌｕｓ ｄｅｎｔｉｃｕｌａｔｕｓ ｓｐ．ｎｏｖ．、１个中国新纪录种：缅甸茸卷象Ｅｕｓｃｅｌｏｐｈｉｌｕｓ ｂｕｒｍａｎｕｓ Ｍａｒｓｈａｌｌ,并将亚种Ｅｕｓｃｅｌｏｐｈｉｌｕｓ ｇｉｂｂｉｃｏｌｌｉｓ ｄｉｍｉｄａｔ     

Parasitism of three attelabid weevils by Bracon (Uncobracon) apoderi Watanabe (Hymenoptera: Braconidae) in Kyushu,Japan

The larval parasitoid Bracon (Uncobracon) apoderi Watanabe (Hymenoptera: Braconidae) is reported from Kyushu for the first time. Two host weevils, Phymatapoderus latipennis and Paroplapoderus pardalis (Coleoptera: Attelabidae), are newly recorded. Bracon apoderi parasitized three attelabid species, including Apoderus balteatus, but did not parasitize Cycnotrachelus roelofsi even though it is a dominant attelabid species in the study site. In addition, B. apoderi mainly parasitized suspended cradles rather than cut‐off cradles.     

Immature Stages of Tomapoderus(T.) ruficollis Fabricius (Coleoptera: Attelabidae) from Korea

Eggs, larvae and pupae of Tomapoderus (T.) ruficollis Fabricius are described and illustrated. The species is found on host plants, Zelkova serrata Makino and Ulmus davidiana var. japonica Nakai. and is a well‐known forest pest. Taxonomic notes and cradle structure of this species are provided.     

Biology and host range of Heterapoderopsis bicallosicollis: a potential biological control agent for Chinese tallow Triadica sebifera

Chinese tallow, Triadica sebifera, is an invasive weed that infests natural and agricultural areas of the south-eastern USA. A candidate insect for biological control of Chinese tallow has been studied under quarantine conditions. The biology and host range of a primitive leaf-feeding beetle, Heterapoderopsis bicallosicollis, were examined between July 2008 and February 2010. H. bicallosicollis adults fed on 16 of 29 non-target species and survived >10 days on all 29 species, more than the number of days that adults survived when deprived of food. Additionally, adult feeding, oviposition and partial larval development occurred on a Florida endangered species, Heterosavia bahamensis. These data indicated that H. bicallosicollis adult feeding and oviposition may not be limited to the target weed and included several valued North American natives. Therefore, as its release could pose unacceptable risks, testing of this species was discontinued and the quarantine colony destroyed.     

Multiple oviposition by Apoderus balteatus (Coleoptera, Attelabidae) is associated with larger leaves

ABSTRACT.

• 1 The female weevil of Apoderus balteatus Roelofs cuts the leaf near its base in order to make a leaf-roll‘cradle', in which one, two or three eggs are laid. Cuts are always located about 5 mm from the leaf base, independent of leaf size.
• 2 Larger leaves are made into larger cradles.
• 3 Weevils tend to lay more eggs in large cradles.
• 4 Eggs are laid through different holes and separated by leaf layers in the cradle. Cannibalism by larvae will be prevented by this isolated oviposition.
• 5 Multiple oviposition of this weevil allows larger leaves to be used by multiple larvae. It facilitates more efficient use of larger leaves and economizes on female effort in cradle formation.

     

中国云南省狭额卷象属一新种（鞘翅目：卷叶象甲科）

记述采自中国云南卷叶象甲科狭额卷象属 Euops1新种:福贡狭额象(Euops fugongensis Liang et Wang,sp.nov.)。它与近缘种九寨狭额象E.jiuzhaiensis的区别在于九寨狭额象的体色黑褐,有金属光泽,前胸背部无皱纹。正模:♂,云南福贡,1300m,1990-Ⅵ-18,梁醒财采。模式标本保存于中国科学院昆明动物研究所。