Spider venom peptides Ht1a and Gg1a are toxic to honeybee parasite Varroa destructor by topical application

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  Spider venom peptides Ht1a and Gg1a are toxic to honeybee parasite Varroa destructor by topical application Abstract Global food supply strongly depends on honeybee pollination services, which are threatened by insecticides and pests such as parasitic Varroa destructor mites. Chemical varroacides/acaricides are hampered by resistance development, necessitating the development of sustainable and environmentally friendly alternatives, with arthropod venom peptides being considered promising sources of acaricidal toxins. With only a few acaricidal venom peptides being reported, we performed a systematic topical screening of 50 arthropod venoms against V. destructor , with 78% of the venoms causing 100% mortality after 24 h. Deconvolution of the venoms from the Tasmanian cave spider Hickmania troglodytes and the Giant Japanese funnel-web spider Gigathele gigas led to identification of the varroacidal peptides Ht1a and Gg1a. Topical application of Ht1a and Gg1a reduced varroa mite ...

Soil Preference and Burrow Characteristics of Two Theraphosidae Species in Penang Island, Malaysia

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Soil Preference and Burrow Characteristics of Two Theraphosidae Species in Penang Island, Malaysia

Abstract

Tarantulas play a crucial role in maintaining ecological balance by regulating insect populations. However, little is known about the soil preferences and burrow structures of tarantulas in Malaysia. This study aims to determine the soil preference as well as the burrow structure of Coremiocnemis cunciularia and Chilobrachys andersoni from Penang Island. The soil characteristics of the soil samples collected around the burrows of Coremiocnemis cunciularia (n = 30) and Chilobrachys andersoni (n = 30) were determined using soil texture analysis. The measurements and burrow structures from adults and juveniles of Coremiocnemis cunciularia and Chilobrachys andersoni were determined. It was revealed that the moisture content and clay percentage in the soil samples around burrows of Chilobrachys andersoni and Coremiocnemis cunicularia were significantly different. Meanwhile, there is some variation in the structure and measurements of the burrows of the two tarantula species. The findings in this study could be useful for the conservation works and habitat management of tarantulas on Penang Island.

Razak, I., Shukor, M., Muhammad Nasir, D. ., Wahab, A. Z., Chai, M. H., & Amirrudin Ahmad. (2026). Soil Preference and Burrow Characteristics of Two Theraphosidae Species in Penang Island, Malaysia. Malaysian Journal of Science (MJS), 45(1), 1–8. https://doi.org/10.22452/mjs.vol45no1.1