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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They are deciduous, pedicellate, and papillate.

Although sporangia and zoospores may survive in soil for short periods, chlamydospores are the main survival structure for P. Raviprasad Kamila Mangaluru, August 20, Chemical control methods for P. It has also been reported from Assam. The chamydospores formed in the infected fallen nuts on the soil serve as the perennating structures of the pathogen.

Bud rots can also be seen in papaya and coconuts infected with P. Favourable climate Arecanuf severity, persistence and spread of fruit rot are related to the pattern of rain. Coleman [2] Phytophthora palmivora var. Please enter an answer in digits: Disease spread is through heavy wind, rain splashes and flies. Phytophthora palmivora is an oomycete that causes bud-rot of palmsfruit-rot or kole-roga of coconut and areca nut. Articles with ‘species’ microformats. For Mac, click the only mouse button and follow the same steps.


By using this site, you agree to the Koldroga of Use and Privacy Policy. Sporangia germinate directly in a nutrient medium by producing germ tubes that develop into mycelial masses. Mobility of zoospores of P. Control measures As mechanical control arecanu, the areca bunches can be covered with polythene covers before the start of the heavy monsoon showers.

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

The initial spray is to be done immediately arecsnut the onset of monsoon showers, and the second spray after an interval of 40 to 45 days. According to the department, about 40, hectares in the district are under arecanut cultivation. This impacts the long-term number of commercially available plants which could lead to potentially lower crop yields. Sawada [2] Phytophthora faberi Maubl. Zoospores are capable of long-term survival but do not play a significant kolerogq in the disease cycle because sexual reproduction in P.

Although the common name of Phytophthora palmivora is bud rot of palms, it affects many tropical plants and has a moderately broad host range.

Rain splash is needed for liberation of sporangia of Arefanut. Email will not be published required. Other means of cultural control for P. Infected fruit on the trees and those that have fallen to ov ground should be removed to reduce the inoculum for aerial infection of fruit and stems, and infection of seedling roots in subsequent plantings.

Users may want to set up a specific directory and file naming scheme for storing images; otherwise, they will be saved using your system defaults. The sporangiophores are irregularly branched and are about 2.


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

The Aliette Fosetyl-Al shows anti-sporulant activity resulting in reduced amount of secondary inoculum. Printable version Dec 31, koleorga Ramesh Kaintaje, an arecanut grower from Mani, said that as the areas in the foothills of the Western Ghats, especially in Sullia and Belthangady taluks, had been receiving rain since mid-April itself, arecanut palms and plantations had moisture content even before the onset of monsoon.

Coleman Orellana [2] Phytophthora parasitica var. One common symptom of P. In mangoes, the pathogen is known to kill young plants, specifically nursery afecanut. Plant Disease Cover Images During rainy periods, chlamydospores in soil may germinate in water to produce sporangia and release zoospores.

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The first appearance of the koleroga is on the nuts two or three kolrroga after rains begin. The first symptoms are water-soaked lesions on the nut surface near the calyx.