Comparing day and night population densities of some arthopods on paddy plants

Hassan S.T.S., . and Ibrahim R.C., . Comparing day and night population densities of some arthopods on paddy plants. pp. 55-59. ISSN 0126-8643

Visual counts of arthropods on paddy at two different locations throughout two different crop growing seasons indicated night population densities to be significantly higher than day population densities for: Leptocorisa acuta Nephotettix spp. Sogatella furcifera Chilo spp. Scotinophara coarctata Hydrellia philippina Casnoidea indica Micraspis discolor dragonflies damselflies spider adults and spider nymphs. The nightime density can be as high as 30 times that of the daytime. Only for Polytoxus selangorensis day population densities were higher than night population densities. In Nilaparvata lugens Recilia dorsalis and Paederus fuscipes their night and day population densities were not significantly different. Most of the SE of the mean densities were less than 30 percent of the means indicating reasonably low variability of estimations hence acceptable precision by the direct visual method. The results of this study indicate that accurate assessment of population densities may need to incorporate consideration of variability of population size even within a day (24 hr) although pest management decisions relying solely on relative assessment of population status may need no critical adjustment at all

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Abstract

Visual counts of arthropods on paddy at two different locations throughout two different crop growing seasons indicated night population densities to be significantly higher than day population densities for: Leptocorisa acuta Nephotettix spp. Sogatella furcifera Chilo spp. Scotinophara coarctata Hydrellia philippina Casnoidea indica Micraspis discolor dragonflies damselflies spider adults and spider nymphs. The nightime density can be as high as 30 times that of the daytime. Only for Polytoxus selangorensis day population densities were higher than night population densities. In Nilaparvata lugens Recilia dorsalis and Paederus fuscipes their night and day population densities were not significantly different. Most of the SE of the mean densities were less than 30 percent of the means indicating reasonably low variability of estimations hence acceptable precision by the direct visual method. The results of this study indicate that accurate assessment of population densities may need to incorporate consideration of variability of population size even within a day (24 hr) although pest management decisions relying solely on relative assessment of population status may need no critical adjustment at all

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Item Type:	Article
Additional Information:	Summaries (En Ms)
AGROVOC Term:	ARTHROPODA
AGROVOC Term:	PLAGAS DE PLANTAS
AGROVOC Term:	DENSIDAD DE LA POBLACION
AGROVOC Term:	ORYZA
AGROVOC Term:	MUESTREO
AGROVOC Term:	MALASIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:52
URI:	http://webagris.upm.edu.my/id/eprint/17356

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