Outbreak of pink disease in intensively managed Eucalyptus grandis plantations in India

Mohanan C., . (1999) Outbreak of pink disease in intensively managed Eucalyptus grandis plantations in India. [Proceedings Paper]

An outbreak of pink disease caused by Corticium salmonicolor occurred in intensively managed Eucalyptus grandis plantations 104 ha in High Ranges at Munnar Kerala Severe infection with multiple main-stem canker bark splitting gummosis girdling etc. occurred in Shenkulam plantation 40 ha Kathippara plantation 24 ha and Kaithachal Plantation 40 ha. In Shenkulam plantation about 10 ha was under substantial disease pressure affecting 98 of the plants. In other areas disease incidence varied from 5 to 95. The plants in valleys and on the bank of the reservoir showed 80-90 infection with medium to high disease severity. The l6-month-old plantation with 99 stocking was under intensive silvicultural management viz. chemical fertilisation soil work weeding mechanical pruning of lower branches etc. The plants showed an exceptionally excellent growth; in Shenkulam the plant height ranged from 5.5 to 8.0 m av. 6.75 m and gbh ranged from 15 to 34 em av. 25 em. In Kathippara the plant height ranged from 3.5 to 6.0 m av. 4.5 m gbh ranged from 9.5 to 23 0 em av. 19 em. Environmental factors including site factors considered to be the major influencing ones for the sudden outbreak of the disease. Heavy rainfall 5055 mm per annum high relative humidity due to the presence of a permanent water source reservoir nearby the plantation conducive micro-climatic conditions brought about by the closed canopy formation in the plantation etc. favoured the quick build-up of the pathogen inoculum infection and its successive spread within and between the plants to an epidemic proportion. Increased host susceptibility due to the development of highly succulent bark in faster grown plants under high input management pathogen virulence etc. are the other possible contributing factors for the outbreak of the disease. Brush-on application of Bordeaux paste 10 in moderately to severely affected plantations Shenkulam 5 ha Kathippara 3 ha Kaithachal 2 ha gave promising results The economics of the fungicidal treatment was worked out and the total cost including labour and chemicals comes around Rs 1.50 per plant. The paper highlights the economic importance of the epidemic analyses the possible environment host pathogen and time factors for the disease outbreak and suggests short-term as well as long-term strategies for combating the disease.

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Abstract

An outbreak of pink disease caused by Corticium salmonicolor occurred in intensively managed Eucalyptus grandis plantations 104 ha in High Ranges at Munnar Kerala Severe infection with multiple main-stem canker bark splitting gummosis girdling etc. occurred in Shenkulam plantation 40 ha Kathippara plantation 24 ha and Kaithachal Plantation 40 ha. In Shenkulam plantation about 10 ha was under substantial disease pressure affecting 98 of the plants. In other areas disease incidence varied from 5 to 95. The plants in valleys and on the bank of the reservoir showed 80-90 infection with medium to high disease severity. The l6-month-old plantation with 99 stocking was under intensive silvicultural management viz. chemical fertilisation soil work weeding mechanical pruning of lower branches etc. The plants showed an exceptionally excellent growth; in Shenkulam the plant height ranged from 5.5 to 8.0 m av. 6.75 m and gbh ranged from 15 to 34 em av. 25 em. In Kathippara the plant height ranged from 3.5 to 6.0 m av. 4.5 m gbh ranged from 9.5 to 23 0 em av. 19 em. Environmental factors including site factors considered to be the major influencing ones for the sudden outbreak of the disease. Heavy rainfall 5055 mm per annum high relative humidity due to the presence of a permanent water source reservoir nearby the plantation conducive micro-climatic conditions brought about by the closed canopy formation in the plantation etc. favoured the quick build-up of the pathogen inoculum infection and its successive spread within and between the plants to an epidemic proportion. Increased host susceptibility due to the development of highly succulent bark in faster grown plants under high input management pathogen virulence etc. are the other possible contributing factors for the outbreak of the disease. Brush-on application of Bordeaux paste 10 in moderately to severely affected plantations Shenkulam 5 ha Kathippara 3 ha Kaithachal 2 ha gave promising results The economics of the fungicidal treatment was worked out and the total cost including labour and chemicals comes around Rs 1.50 per plant. The paper highlights the economic importance of the epidemic analyses the possible environment host pathogen and time factors for the disease outbreak and suggests short-term as well as long-term strategies for combating the disease.

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Item Type:	Proceedings Paper
Additional Information:	Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. Call number mal SB 950 I61 1999
AGROVOC Term:	Eucalyptus grandis
AGROVOC Term:	Plantations
AGROVOC Term:	Corticium
AGROVOC Term:	Infection
AGROVOC Term:	Cankers
AGROVOC Term:	Bark
AGROVOC Term:	Gummosis
AGROVOC Term:	Girdling
AGROVOC Term:	Disease incidence
AGROVOC Term:	Silvicultural systems
Geographical Term:	MALAYSIA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 05:14
URI:	http://webagris.upm.edu.my/id/eprint/12255

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