Effect of detasseling and stalk removal of corn on infestation of Asian corn borer, Ostrinia furnacalis (Guenee) (Pyralidae: Lepidoptera) / Sieng Klitsaneephaiboon.
Material type:
TextLanguage: English Publication details: Los Baños, Laguna : 1983. Cavite State University- Main Campus,Description: 328 pages : illustrations ; 28 cmContent type: - text
- unmediated
- volume
- 633.15 K68 1983
| Item type | Current library | Collection | Call number | Materials specified | URL | Status | Notes | Date due | Barcode |
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Ladislao N. Diwa Memorial Library Theses Section | Non-fiction | 633.15 K68 1983 (Browse shelf(Opens below)) | Link to resource | Room use only | T-1427 | 00002310 |
Thesis (Ph.D. - - Entomology) University of the Philippines, College, Laguna.
Includes bibliographical references.
KLITSANEEPHAIBOON, SIENG, University of the Philippines at Los Banos, November, 1983. Effect of Detasseling and Stalk Removal of Corn on Infestation of Asian Corn Borer, Ostrinia furnacalis (Guenee) (Pyralidae: Lepidoptera). Major Professor: Dr. Fernando F. Sanchez
The effects of detasseling and stalk removal above the ear of com plants, tassel ratio index, parasitism on plant at maturity and pollen application to the leaf axils above the ear, were studied for population regulation and infestation of Asian Corn borer, ©. furnacalis, during the wet and dry seasons, 1982-1983.
Dry season planting had a more rapid rate of plant development, higher tassel bud ratio and earlier tasseling and silking than the wet season.
There was no difference in adult oviposition between untreated and treated plants. Counts of egg masses increased at vegetative stage and decreased at the reproductive stage of plants in both seasons,
At tassel emergence, the larval population collected from the tassel in both seasons was greatly higher than the larval population collected from other plant parts. Association and relationship of the number of larvae and tunnels above the ear, at the ear and shank and below the ear were high but very low at the tassel.
Larval population recorded from the tassel at silk emergence was much lower than that at tassel emergence, but the number of pupae and tunnels were slightly higher.
Stalk removal at the dough stage showed greater numbers of larvae, pupae and tunnels than stalk removal at beginning dent and fully dented stages. In the absence of chemicals, detasseling before pollination showed the greatest reduction in the
number of pupae and tunnels above the ear compared to detasseling after pollination and intact plants with tassels.
At harvest, detasseling before pollination even without insecticide treatment reduced the number of tunnels in different plant parts, equal to the result of detasseling after pollination or intact plants with tassels and insecticide treatment.
Stalk removal did not reduce corn yields significantly. The combination of detasseling before pollination and without insecticide treatment gave higher yields than the combination of detasseling after pollination or intact plants with tassels and insecticide application. The parasites were few at harvest. Detasseling with or without adding pollen grains to the leaf axils and intact plants with tassels had no influence on infested tassels and larval population at tassel emergence, egg oviposition at 55 and 65 DAE and number of tunnels at 75 DAE, but influenced the number of tunnels and yields at harvest.
Submitted to the University Library 01/07/1994 T-1427