Impact of cropping intensity and asynchromy on the epidemiology of rice tungro virus in Malaysia

Bottenberg H., . and Litsinger J.A., . and Loevinsohn M.E., . and Kenmore P.E., . Impact of cropping intensity and asynchromy on the epidemiology of rice tungro virus in Malaysia. pp. 103-116. ISSN 0127-6883

Results of correlation analyses of survey data on tungro incidence vector abundance seasonal rainfall and rice cropping patterns in the Muda region Kedah Malaysia show tungro vector (Nephotettix spp. and Recilia dorsalis) were more prevalent in intense and asynchronous rice cropping patterns in the 1982 dry season crop. Tungro incidence and total vector abundance were not related with rice cropping pattern in the 1982 and 1983 wet seasons. However tungro was more widespread in sites with high rainfall in the 1983 wet season. Tungro incidence and total vector abundance correlated only in the 1982 wet season suggesting that once tungro is established in an area vector abundance may play a less significant role in disease spread. Total vector abundance of the 1983 wet season was positively related to the previous season's vector catch but no relation was found between tungro incidence in sucessive seasons. Stepwise regression showed that rainfall is the best predictor for vector abundance and tungro incidence. A more quantitative measure of the extent of tungro infection is needed to confirm these conclusions. Examination of survey records suggests that tungro outbreaks may be triggered by extended dry periods.

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Abstract

Results of correlation analyses of survey data on tungro incidence vector abundance seasonal rainfall and rice cropping patterns in the Muda region Kedah Malaysia show tungro vector (Nephotettix spp. and Recilia dorsalis) were more prevalent in intense and asynchronous rice cropping patterns in the 1982 dry season crop. Tungro incidence and total vector abundance were not related with rice cropping pattern in the 1982 and 1983 wet seasons. However tungro was more widespread in sites with high rainfall in the 1983 wet season. Tungro incidence and total vector abundance correlated only in the 1982 wet season suggesting that once tungro is established in an area vector abundance may play a less significant role in disease spread. Total vector abundance of the 1983 wet season was positively related to the previous season's vector catch but no relation was found between tungro incidence in sucessive seasons. Stepwise regression showed that rainfall is the best predictor for vector abundance and tungro incidence. A more quantitative measure of the extent of tungro infection is needed to confirm these conclusions. Examination of survey records suggests that tungro outbreaks may be triggered by extended dry periods.

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Item Type:	Article
Additional Information:	3 ill.; 5 tables; 30 ref. Summary (En)
AGROVOC Term:	ORYZA SATIVA
AGROVOC Term:	VIRUS DE LAS PLANTAS
AGROVOC Term:	NEPHOTETTIX
AGROVOC Term:	RECILIA DORSALIS
AGROVOC Term:	MALASIA/ ORDENACION DE CULTIVOS
AGROVOC Term:	EPIDEMIOLOGIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:56
URI:	http://webagris.upm.edu.my/id/eprint/20314

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