Response of Pyricularia oryzae populations to integrated disease management

Chin K . M ., . (1985) Response of Pyricularia oryzae populations to integrated disease management. [Proceedings Paper]

The ability of Pyricularia oryzae populations in rice Oryza sativa to respond to selection by benomyl treatment and host resistance was demonstrated in controlled discreted generation experiments. The observed levels of insensitivity and photogenecity were compared with expected levels calculated from Barrett's selection model. Changes in the size of the pathogen population were also followed. With moderated host resistance a reduced level of benomyl application provided better disease control than either control measure applied singly. With a higher level of host resistance whilst there was little further advantage in disease control from benomyl application there was a long term advantage in delayed pathogen adaptation to either control measure. The results are discussed in relation to a model presented earlier on pathogen evolution in an integrated system of disease management. In general diversity should be encouraged but cross relationships between pathogenicity and insensitivity and between insensitivity to different fungicides require careful consideration.

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Abstract

The ability of Pyricularia oryzae populations in rice Oryza sativa to respond to selection by benomyl treatment and host resistance was demonstrated in controlled discreted generation experiments. The observed levels of insensitivity and photogenecity were compared with expected levels calculated from Barrett's selection model. Changes in the size of the pathogen population were also followed. With moderated host resistance a reduced level of benomyl application provided better disease control than either control measure applied singly. With a higher level of host resistance whilst there was little further advantage in disease control from benomyl application there was a long term advantage in delayed pathogen adaptation to either control measure. The results are discussed in relation to a model presented earlier on pathogen evolution in an integrated system of disease management. In general diversity should be encouraged but cross relationships between pathogenicity and insensitivity and between insensitivity to different fungicides require careful consideration.

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Item Type:	Proceedings Paper
Additional Information:	2 tables; 25 ref. Summary En
AGROVOC Term:	ARROZ
AGROVOC Term:	ENFERMEDADES FUNGOSAS
AGROVOC Term:	RESISTENCIA A LA ENFERMEDAD
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:25
URI:	http://webagris.upm.edu.my/id/eprint/13932

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