| Author | Do Thi Thanh Huyen |
| Call Number | AIT Thesis no. AS-97-20 |
| Subject(s) | Tomatoes--Diseases and pests--Vietnam--Dalat
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of
Master of Science in Agricultural systems, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. AS-97-20 |
| Abstract | The feasibility of IPM for tomato fruit worm (TFW) was examined to reduce the
chemical usage in commercial vegetable production in Dalat during January-May 1997
using a combination of survey and field experiment.
Results from the survey involving farmers, extension and agricultural officers showed
that the current farmers' practices for controlling TFW was mainly chemical insecticides,
followed by cultural practices, and manual control practice. Microbial control has not been
widely applied. Insecticides used to control TFW are highly hazardous and moderately
hazardous. Farmers frequently exceed recommended concentrations in using chemicals and
mix two or more in a single application. The initial applications are usually in the
vegetative period to flowering and continued at fixed intervals until maturing. The
extension services are weak with little direct contact with farmers.
The comparison field experiment with three treatments showed that Bacillus
thuringiensis is as effective against TFW as chemical insecticides. Bt does not harm the
parasitoids and predators of TFW as do chemicals. Many kinds of predators and three
kinds of TFW' s parasitoids including egg parasitoids and larval parasitoids were found in
the experimental field. The major pests are TFW, aphids, leaf miners, early blight, late
blight and tomato virus. The field experiment also indicated that tomato cultivars were not
well adapted to local conditions. |
| Year | 1997 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AS-97-20 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Aquatic Systems (AS) |
| Chairperson(s) | Tinsley, Richard L. ;Johnsen, Steffen; |
| Examination Committee(s) | Downer, Roger G. H. ;Rakshit, Sudip K.; |
| Scholarship Donor(s) | Swedish International Development Cooperative
Agency (Sida) ; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1997 |