Shizocera
| Shizocera sp. (Mo sawfly) | |
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| Shizocera sp. lavae | |
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Not evaluated (IUCN 3.1)
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Hymenoptera |
| Suborder: | Symphyta |
| Family: | Argidae |
| Genus: | Shizocera |
| Species: | see text |
Shizocera is a genus of sawflies in the family Argidae.
Shizocera (Hymenoptera: Argidae), the Mo sawfly, commonly called ‘Sâu ăn lá Mỡ’ ('Mo-leaf-eating-caterpillar') or 'Sâu Ong' ('bee-like caterpillar') by the local people, has been noticed in pure stands of 'Mo' trees () in northern regions of Vietnam since 1966. The insect (larva) feeds on leaves and is also found in natural forest where the tree is scattered. Because the host tree and its pest have a limited distribution, the literature on the pest has been very limited and mostly confined to the local language.
Mo sawfly was first reported from the results obtained in a study carried out by the Forest Research Institute of Vietnam from 1971–76, in an experimental forest station in Vinh Phuc Province.
The Mo sawfly deposits eggs under the epidermis of the leaf, in two rows on either side of the midrib. The incubation period depends on the temperature – it may range from 3 days at 28 °C to 26 days at 16 °C. As the eggs develop, they increase in size, as do the eggs of other sawflies, by absorbing water from the leaf. The larvae pass through five instars in the male and six in the female. The larval period ranges from about 17 days at 24 °C to 32 days at 19 °C. The mature larva falls down and creeps into the ground to make a cocoon.
As in other sawflies, three developmental stages are passed within the cocoon – eonymph, pronymph and pupa. The duration of the eonymph stage is short, pronymph stage is 13–15 days and pupa, 8 days at 27 °C to 15 days at 18 °C. The life cycle is completed in 59–65 days at 22–24 °C and 85–86% RH.
The Mo sawfly appears to prefer a temperate climate of 21–24 °C, monthly precipitation of 50–150mm and RH of 85–88%. Under some combinations of climatic factors, the Mo sawfly enters diapause and/or aestivation (see below).
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Wikipedia