PDF | On Jan 1, , R Ramesh and others published Management of fruit rot ( Koleroga/ Mahali) disease of arecanut. MANAGEMENT OF FRUIT. ROT (KOLEROGA/ MAHALI). DISEASE OF ARECANUT. Acknowledgement: Dr. Vinayak Hegde, Central Plantation Crops. DISEASES OF ARECANUT. 1. Koleroga or Mahali or fruit rot: Phytophthora meadii Me Rae. Koleroga or rot disease has been a serious disease of areca palms.

Koleroga Of Arecanut Pdf

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"Record". Control of fruit rot or koleroga disease of arecanut (Areca catechu L.) [ ]. Sastry, M.N.L. Hegde, R.K. (University of Agricultural Sciences, Dharwad. Control of fruit rot or koleroga disease of arecanut areca catechu l. Sastry, M.N.L.; Hegde, R.K.. Tropical Agriculture 65(2): Field experiments to. Among the diseases, fruit rot (Koleroga) of arecanut caused Fruit rot or Mahali disease of Arecanut (Areca catechu L.) is a serious threat from.

Multiplying leaf number by 40 and subtracting the seedling height gives the selection index. Select seedlings with higher selection index values. Uproot the seedlings with the ball of earth attached to them for transplanting. Note: Plant characters such as girth at the collar one year after transplanting and number of nodes two years after transplanting are highly correlated with yield.

Removal of plants with poor collar girth and lesser number of nodes one and two years after planting respectively, will help to increase the yield potential of plantations. Field Planting Selection of site and layout: The crop thrives well in humid areas protected well against hot sun and heavy wind.

Since the areca palm does not withstand either water logging or drought, the site selected should have proper drainage and adequate source of water for irrigation. Arecanut palm cannot withstand extreme temperature and exposure to direct sun.

Control of fruit rot or koleroga disease of arecanut (Areca catechu L.) [1988]

So the site selected should have protection from southern and western sides. The soil depth and the depth of water table are other two parameters to be considered while selecting the site.

The soil should be deep preferably not less than two meters and water table should be sufficiently low for better root development. Spacing: This depends on the rooting pattern of the crop along with the fertility and depth of the soil. The studies conducted at different places with different spacing have revealed that a spacing of 2.

This was justified by the root distribution studies also.

Planting: Dig pits of size 60 x 60 x 60 cm and fill up with rich top soil to a level of 15 cm from the bottom. Plant seedlings at the center of the pit, cover with soil up to collar level and press around. In well-drained soils and in the fields where proper drainage can be provided, deep planting is preferred.

Deeper planting provides a firm anchorage and larger volume of space for root development. In areas where water table is high, shallow planting is preferred.

Thus in well-drained soils, planting at a depth of 90 cm is recommended and in heavy soils planting at a depth of 60 cm is recommended. Season of planting: In areas where South-West monsoon is severe, planting in the month of September-October is recommended.

The planting is to be done during May-June in well drained soils and during August-September in clayey soils Shading: The palms are highly susceptible for sun scorching. The seedlings should be given protection against the direct exposure to sun.

This may be done by either covering the plants with areca or coconut leaves or by raising crops like banana in between two rows of arecanut. Sun scorching is mostly seen during October — January. During this period even the stems of young palms have to be protected.

Control of fruit rot or koleroga disease of arecanut areca catechu l

For this a quick growing shade plant can be planted on Southern and Western sides of the garden. Cultural Operations: Keep the garden free of weeds and break up surface crust by light forking or digging after cessation of monsoon during October-November.

In slopes, prevent soil erosion by terracing. Sow seeds of green manure-cum-cover crops such as Mimosa invisa, Stylosanthes gracilis and Calapagonium muconoides in April-May with the onset of pre-monsoon rains.

Cut and apply them to the palms in September-October. Nutrient management Apply green leaf and compost, each at the rate of 12 kg per palm per year from first year of planting onwards, during September-October.

Under irrigated conditions, apply fertilizers in two split doses, the first during September-October and the second during February. Under rainfed conditions, apply the second dose during March-April after the receipt of summer rains. Apply manures and fertilizers during September-October in circular basins of cm depth and with a radius of 0. Apply the second dose of fertilizers around the base of palm after weeding and mix into soil by light forking.

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In acidic soils, broadcast lime at the rate of 0. Fertigation: Application of nutrients through irrigation water is called as fertigation. This procedure can be profitably followed in arecanut. The fertilizer should be split into ten parts and should be applied once in 20 days from November to May. Organic matter recycling: On an average, 5. This can be effectively used as organic source of nutrients for areca palms.

Package of practices for cultivation of Arecanut is provided here.

But direct application of these wastes in the garden will take long time for decomposition and will not meet the nutrient demand of the crop immediately. Hence, these materials can be composted using earthworms effectively and used as organic manure in areca gardens. To prepare vermicompost, areca wastes are chopped into small pieces of 10 cm and heaped.

Then the chopped material is arranged in beds of one-meter width and convenient length. Cement tanks or trenches can be used for this purpose. An affected nut with leslons. Also known as "mahali" in Malayalam and "koleroga" in Kannada, the disease may cause fruit drop of 50 to per cent in individual palms.


Scientists at the Central Plantation Crops Research Institute's CPCRI's Regional Station at Vittal, Karnataka, have come out with suitable package of practices to effectively manage the disease and make areca nut cultivation more remunerative to the growers.

Disease symptoms "This disease occurs during South West monsoon. Its symptoms are invariably noticed as dark green water-soaked lesions near the perianth calyx.

Sri Lanka Journal of Food and Agriculture

The infected fruits loose their natural green colour. The lesions on the fruits gradually spread covering the whole surface before or after shedding. The disease leads to heavy shedding of fruits,"explains Dr. The infection of heartleaf results in bud rot and the outermost leaf sheath leads to crown rot. Both bud rot and crown rot are noticed during the South West monsoon season and continue in the cooler month falling in between October and February.

Favourable climate The severity, persistence and spread of fruit rot are related to the pattern of rain. The disease appears usually 15 to 20 days after the onset of regular monsoon rains and may continue up to the end of the rainy season.Zoospores are capable of long-term survival but do not play a significant role in the disease cycle because sexual reproduction in P.

Light is inhibitory to zoospore formation but stimulatory to zoospore germination. In India it is extensively used by large sections of people and is very much linked with religious practices.

Whereas the third week of may month gives the better maximum nut drop was recorded untreated management of fruit rot. Its symptoms are invariably noticed as dark green water-soaked lesions near the perianth calyx.

Since the areca palm does not withstand either water logging or drought, the site selected should have proper drainage and adequate source of water for irrigation. Parris, G. Butler E.

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