Le Nam Hung
Nguyen Van Do
Every year Shellac production is seriously damaged by insects ( more than 30%, Le Van Giai, 1965) and mainly by white butterfly. Based on research carried out on this butterfly in China, Wang Kinh Ti ( 1963) expressed similar opinions.
RESEARCH CONTENT AND RESULTS
After three years of raising white butterfly in the laboratory and experimental gardens (1971 – 1973), some results are as follows,
1. The white butterfly is a small species which is active at night, from 22p.m to 2 a.m. Females have 310 – 375 eggs, but they produce only 160-180 eggs. Eggs are scattered on the nest, with a maximum of 5 eggs/1cm2 and are produced just after settlement. In the early stage, young worms build a nest which can be easily seen.
At a temperature of 27oC, eggs developed within 8-10 days; larvae have 5 stages and develop in 30-35 days, and the pupae stage can develop within 11.5 days in 25oC conditions. One life cycle of the while butterfly lasts 60-70 days. In one year at Luongson, Hoabinh province, the white butterfly can produce 5 generations.
In 1972 in Maichau and Luongson, Hoabinh province, Lac insects were damaged by the white butterfly at a rate of 0.30 fly/1cm2. In Luongson where Lac insects were raised in great numbers the damage was less.
Latest news
- Project: Study on integrated management of insect pests and diseases on Docynia indica in northern Vietnam
- Project: Study on integrated pest management of major leaf insect pests and stem borer beetles in Acacia hybrid, A. mangium and A. auriculiformis in Vietnam
- Project: Research and develop an integrated management program for control of cinnamon pests in some main cinnamon growing areas (Northern mountainous region and Quang Nam province)
- Project: Pilot plantation and completion of planting techniques of technologically advanced germplasm of Acacia auriculiformis (AA42, AA53, AA56, AA92, AA95) for sawlog in the southeast and south central.
- Project "Research on selection of varieties and intensive afforestation techniques of Prunus arborea (Blume) Kalkman for providing lager timber in the Northeast and Northwest regions, Vietnam"
Oldest news
- techniques of raising lac insects at quanhoa lac insect research station (thanhhoa province)
- research results on forest reclamation by chukrasia tabularis ( 1981 - 1985)
- Results of species and provenance trials of eucalyptus, period 1990 - 1992
- preliminary results of provenance trial, breeding and vegetation propagation for casuariana equisetifolia
- species and provenance trials of acacias
