Koleroga or Mahali is a major disease of arecanut causing serious losses. The pathogen is a fungus Phytophthora palmivora. Spraying the. PDF | On Jan 1, , R Ramesh and others published Management of fruit rot ( Koleroga/ Mahali) disease of arecanut. Koleroga (kole = rotting, roga = disease) as it is called in Karnataka is in the same orchard (as found in Karnataka where arecanut, cocoa, cardamom, black.

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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. Butler[2] Phytophthora palmivora var. Rain and wind are the two major factors in the epidemiology of Phytophthora kolerogga rot of papaya.

Orellana [2] Phytophthora palmivora var. The green colour koelroga the nut-shell turns darker green and the early symptoms gradually spread ultimately covering the entire surface of the nut. Please enter an answer in digits: Cultural practice is also important in the management of Phytophthora diseases of papaya.

Bud rots are also found in Palmyra palms and coconut palms.

Favorable temperature is also a contributing factor to the severity koleeroga Phytophthora diseases because of its effect on growth and sporulation of the pathogen. Continuous rain with good light disfavour disease spread because the plenty of sporangia and, in turn, the zoospores produced in these conditions are washed off by the continuous rain.

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‘Kole roga’ strikes arecanut plantations in Dakshina Kannada again

This notice hereby grants permission to APS users to copy the image featured for noncommercial, personal use. The virgin soil method has the advantages of being relatively inexpensive, very effective and nonhazardous.

In coconuts, the expected yield losses caused by P. Phytophthora root rot of papaya seedlings is most serious during rainy periods.

According to the office of the Deputy Commissioner, the district recorded an average rainfall qrecanut 4, August 20, Genetic Recombination in Bacteria: Raviprasad Kamila Mangaluru, August 20, The disease spreads from palm to palm and from orchard to orchard. As previously stated impacts of P. One spray of Bordeaux mixture in the month of May as prophylactic kolerogs and another after 6 weeks during break in the monsoon prove quite effective in controlling disease.

For Mac, click the only mouse button and follow the same steps. Techniques for controlling moisture include: These are among the most serious diseases caused by fungi and moulds in South India.

Fruit Rot of Betel Nut or Areca Nut Palm

Zoospores are arecaut of long-term survival but do not play a significant role in the disease cycle because sexual reproduction in P.

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Sporangia produced from primary infection lesions serve as the source of secondary infections during the growing season. 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.

Its symptoms are invariably noticed as dark green water-soaked lesions near the perianth calyx. Root rot of papaya seedlings, caused by P. Disease symptoms “This disease occurs during South West monsoon. Root rots are another symptom of P. Coleman Orellana [2] Phytophthora parasitica var.

Covering the arecanut branches with polythene bags as a prophylactic measure provides cent percent control of the disease but it is costlier than fungicide spray. Australian Plant Joleroga Society, appsnet.

It severely affects the fruits nuts of the areca palm during June to September when there is heavy rainfall cm in these areas. Arecabut arecanut hit by fruit rot collected by Ramesh Kaintaje, a grower near Mani in Dakshina Kannada district.

Koleroga Disease of Areca Palms: Symptoms and Management | Plant Pathology

Sporangia are usually produced in clusters sympodially. Articles with ‘species’ microformats. Retrieved 18 June