Biological control of sclerotium stem rot of tomato in Thailand

Chamswarng C., . Biological control of sclerotium stem rot of tomato in Thailand. pp. 77-83. ISSN 0127-6883

Sorghum seeds colonised with each of the isolates of Trichoderma spp. and Gliocladium virens were applied around the stem base of 24-day old tomato (Sida-KU) seedlings at the rate of 25 ml/plant in order to protect the plants against infection caused by Sclerotium folfsii. Half of the inoculated seedlings was kept under screenhouse conditions whereas the rest was transplanted into field plots. Inoculation of treated plants with Sclerotium inoculum revealed that the percentages of surviving seedlings of the treated plants maintained in screenhouse and the field were in the ranges of 6.7-26.7 percent and 17.3-38.1 percent increase over the control respectively. Several mixtures of Trichoderma prepared by adding the powder of Trichoderma harzianum with different levels of rice barn compost and urea (i.e. 1:10:25 and 1:24:25 by weight) were applied around the stem base of field transplanted tomato plants 4-10 days before inoculation of S. rolfsii. Infection percentage of plants treated with Trichoderma mixture of the first experiment ranged from 0 to 8.9 percent whereas the disease incidence in the control was 51.1 percent. In the second experiment significant protection was obtained when plants were treated with various mixtures of Trichoderma spp. The surviving plants ranged from 72.7-91.7 percent or 19.9-38.9 percents improve over the control. Addition of 0.5 percent by weight urea to the mixtures enhanced the protection efficacy of Trichoderma spp. Results therefore indicate the potential for using isolates of Trichoderma spp. as biological control agents of S. rolfsii on tomato

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Abstract

Sorghum seeds colonised with each of the isolates of Trichoderma spp. and Gliocladium virens were applied around the stem base of 24-day old tomato (Sida-KU) seedlings at the rate of 25 ml/plant in order to protect the plants against infection caused by Sclerotium folfsii. Half of the inoculated seedlings was kept under screenhouse conditions whereas the rest was transplanted into field plots. Inoculation of treated plants with Sclerotium inoculum revealed that the percentages of surviving seedlings of the treated plants maintained in screenhouse and the field were in the ranges of 6.7-26.7 percent and 17.3-38.1 percent increase over the control respectively. Several mixtures of Trichoderma prepared by adding the powder of Trichoderma harzianum with different levels of rice barn compost and urea (i.e. 1:10:25 and 1:24:25 by weight) were applied around the stem base of field transplanted tomato plants 4-10 days before inoculation of S. rolfsii. Infection percentage of plants treated with Trichoderma mixture of the first experiment ranged from 0 to 8.9 percent whereas the disease incidence in the control was 51.1 percent. In the second experiment significant protection was obtained when plants were treated with various mixtures of Trichoderma spp. The surviving plants ranged from 72.7-91.7 percent or 19.9-38.9 percents improve over the control. Addition of 0.5 percent by weight urea to the mixtures enhanced the protection efficacy of Trichoderma spp. Results therefore indicate the potential for using isolates of Trichoderma spp. as biological control agents of S. rolfsii on tomato

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Item Type:	Article
Additional Information:	4 tables 10 ref. Summary (En Ms)
AGROVOC Term:	TOMATE
AGROVOC Term:	SCLEROTIUM
AGROVOC Term:	CONTROL BIOLOGICO
AGROVOC Term:	TAILANDIA
AGROVOC Term:	TRICHODERMA
AGROVOC Term:	GLIOCLADIUM
AGROVOC Term:	SORGHUM
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:56
URI:	http://webagris.upm.edu.my/id/eprint/20636

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