Nguyen Duc Kham
Le Xuan Nguyen
INTRODUCTION
Previously, some scientists have paid attention to studying or summing up techniques of Lac insect raising in practice. However, these documents still have many limitations because the biological characteristics of the Lac insects were not fully investigated.
RESEARCH CONTENT AND RESULTS
The research subject has found a preliminary solusion to the following problems:
1. Lac insects used in practice consist of not only one, but 3 Lac insect species. The species named Laccifer Lacca has two races which have different biological characteristics. M1 race is most frequently found in practice.
2. Reproduction: Lac insects have two types of reproduction, however our experiments showed that vegetative reproduction, continuously in 3 generations, is not normal ( this is also different from information published formerly). Lac insects can also reproduce with larvae. This is not a good phenomenon and often occurs in years with poor production.
3. Development of embryo: developing Lac insects have 12 stages, however, only the latter 3-8 stages are easily distinguished and are used as an indicator for supplying breeds. Moreover, it must be noted that temperature can change the length of each stage. In particular in those years with bad production, the tissue reducing stage can be very long. Therefore, predictions based only on the embryo morphology factor are uncertain.
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
- study on finding measures for prevention and control of white butterfly eublemma amabilis moore which causes damage for lac insects ( 1971 - 1973)
- 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
