Action thresholds of wet rice arthropods for pest management decision-making in Malaysia

S. T. S. Hassan, . Action thresholds of wet rice arthropods for pest management decision-making in Malaysia. pp. 65-74. ISSN 0126-6128

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 (P0.001) affected by arthropod category and growth stage of the crop. The observed P(I) indicated high fits (most r20.90) to clumped- and Poisson-based distribution models.

Full text available from: Official URL: http://www.pertanika2.upm.edu.my/Pertanika%20PAPER...

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 (P0.001) affected by arthropod category and growth stage of the crop. The observed P(I) indicated high fits (most r20.90) to clumped- and Poisson-based distribution models.

[error in script]

Item Type:	Article
AGROVOC Term:	Rice
AGROVOC Term:	Experimentation
AGROVOC Term:	Arthropods
AGROVOC Term:	Pest management
AGROVOC Term:	Decision making
AGROVOC Term:	Economic thresholds
AGROVOC Term:	Infestation
AGROVOC Term:	Malaysia
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	27 Apr 2025 23:20
URI:	http://webagris.upm.edu.my/id/eprint/22713

Actions (login required)

View Item