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| Title: | Action thresholds of wet rice arthropods for pest management decision-making in Malaysia |
| Authors: | S. T. S. Hassan |
| Issue Date: | 1997 |
| Citation: | Pertanika Journal Of Tropical Agricultural Sciences (Malaysia), 20 (1), p. 65-74 |
| Abstract: | Action thresholds to aid pest population management decision-making of 11 categories of wet rice arthropods are suggested in terms of mean population density per hill (x) and proportion of infestation (P(I)) of the field sampling units. The thresholds are the (x) and P(I) values at the point of saturation of a polynomial regression curve obtained by plotting (x) against P(I) for each arthropod category. The respective values for pests are: 3.38, 0.92 (Nephotettix spp.), 6.28, 1.00 (Nilaparvata lugensj, 1.37, 0.72 (Cnaphalocrocis medinalis-Pyralidae), 2.42, 0.90 (Recilia dorsalisj, 3.81, 0.97 (Sogatella furciferaj) and for predators are: 3.89, 0.98 (Cyrtorhinus lividipennis), 2.39, 0.85 (Anatrichus pygmaeus-Diptera), 2.02, 0.82 (Odonata), 1.65, 0.81 (Casnoidea spp), 1.61, 0.64 (Paederus fuscipes) and 1.60, 0.69 (spiders). P(I) is significantly (P<0.001) affected by arthropod category and growth stage of the crop. The observed P(I) indicated high fits (most r2>0.90) to clumped- and Poisson-based distribution models. |
| License: | http://www.oceandocs.org/license |
| URI: | http://agris.upm.edu.my:8080/dspace/handle/0/14692 |
| Related document: | http://www.pertanika2.upm.edu.my/Pertanika%20PAPER... |
| ISSN: | 0126-6128 |
| Appears in Collections: | Publications
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