Control of Phytophthora on four temperate and tropical tree crops by trunk injection with phosphorous acid

Lim T.M., . and Lee B.S., . (1990) Control of Phytophthora on four temperate and tropical tree crops by trunk injection with phosphorous acid. [Proceedings Paper]

World-wide in distribution different species of Phytophthora attack a wide range of crop plants grown over many climatic zones. Among the diseases incited on plantation tree crops those affecting the roots and basal stems are particularly destructive. The fungus infects and grows mainly within the woody tissues often below-ground making its detection difficult and treatment costly. Control with systemic fungicides applied in the conventional manner often fails due to poor chemical uptake or translocation within woody issues of the infected trees. Recent successful development in Australia of phosphorous acid applicable by trunk injection in controlling P.cinnamomi on avocado however led to similar trials being set up against P.cactorum on peach and apricot in Victoria against P. palmivora on rubber in Burma and Malaysia and on durian in Malasyia. On 8-year-old peach PA was injected at 4 g/tree at 1 week before or 4 weeks after fungal inoculation on the basal trunk. Similar treatments were made on 20-year-old apricot trees with the PA dosages at 8 and 10 g/tree respectively for pre- and post-inoculation treatments. When assessed for trunk lesion growth at 1 year PA was found to prevent lesion formation when applied before inocualtion and suppressed growth of established lesions when applied after inoculation. On 6-year-old rubber clone RRIM 600 in Burma PA applied at 4 g/tree at the onset of monsoon greatly reduced Phytophthora leaf fall. A similar result was shown on an older RRIM 600 stand in Malaysia with a parallel trial showing PA to totally prevent black stripe infection on the tapping panel of previously injected tree. On a severely diseased 12-year-old durian orchard PA injected at the dosages from 8-25 g/tree arrested further growth of the trunk lesions which dried up and yielding no more Phytophthora when assessed at 8 months. The above results of PA applied by trunk injection to confer both preventive and curative effects of these selected four representative tree crops now opens a way for an efficient and economic novel means of controlling Phytophthora world-wide

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Abstract

World-wide in distribution different species of Phytophthora attack a wide range of crop plants grown over many climatic zones. Among the diseases incited on plantation tree crops those affecting the roots and basal stems are particularly destructive. The fungus infects and grows mainly within the woody tissues often below-ground making its detection difficult and treatment costly. Control with systemic fungicides applied in the conventional manner often fails due to poor chemical uptake or translocation within woody issues of the infected trees. Recent successful development in Australia of phosphorous acid applicable by trunk injection in controlling P.cinnamomi on avocado however led to similar trials being set up against P.cactorum on peach and apricot in Victoria against P. palmivora on rubber in Burma and Malaysia and on durian in Malasyia. On 8-year-old peach PA was injected at 4 g/tree at 1 week before or 4 weeks after fungal inoculation on the basal trunk. Similar treatments were made on 20-year-old apricot trees with the PA dosages at 8 and 10 g/tree respectively for pre- and post-inoculation treatments. When assessed for trunk lesion growth at 1 year PA was found to prevent lesion formation when applied before inocualtion and suppressed growth of established lesions when applied after inoculation. On 6-year-old rubber clone RRIM 600 in Burma PA applied at 4 g/tree at the onset of monsoon greatly reduced Phytophthora leaf fall. A similar result was shown on an older RRIM 600 stand in Malaysia with a parallel trial showing PA to totally prevent black stripe infection on the tapping panel of previously injected tree. On a severely diseased 12-year-old durian orchard PA injected at the dosages from 8-25 g/tree arrested further growth of the trunk lesions which dried up and yielding no more Phytophthora when assessed at 8 months. The above results of PA applied by trunk injection to confer both preventive and curative effects of these selected four representative tree crops now opens a way for an efficient and economic novel means of controlling Phytophthora world-wide

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Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	CULTIVOS
AGROVOC Term:	INYECCION EN EL ARBOL
AGROVOC Term:	PHYTOPHTHORA/ CONTROL DE ENFERMEDADES
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:26
URI:	http://webagris.upm.edu.my/id/eprint/15288

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