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. However, chlamydospores produced in papaya juice at lower concentrations or in other kinds of fruit juice are mostly thin-walled. Host resistance is also a method of controlling the pathogen, resistant plants generally have thicker cuticles which inhibits the ability of the pathogen to enter the host.

Bipolaris incurvata Botryosphaeria cocogena Bursaphelenchus cocophilus Cadang-cadang Capnodium footii Cephaleuros virescens Corticium penicillatum Cytospora palmarum Marasmiellus cocophilus Periconiella cocoes Pestalotiopsis palmarum Phaeochoropsis mucosa Phyllosticta palmetto Phytophthora palmivora Pseudoepicoccum cocos Ramularia necator Stigmina palmivora.

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

This impacts the long-term number of commercially available plants which could lead to potentially lower crop yields. Plant Disease Cover Images It is believed that where many crops are grown simultaneously in the same orchard as found in Karnataka where arecanut, cocoa, cardamom, black pepper, and citrus are grown simultaneously in the same plantationand they are infected by two to three species of the some pathogen e. As previously stated impacts of P. Both A1 and A2 isolates can produce zoospores by selfing when stimulated by sex hormones produced by A2 and A1, respectively.

One spray of Bordeaux mixture in the month of May as prophylactic measure and another after 6 weeks during break in the monsoon prove quite effective in joleroga disease.

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Sexual reproduction in Phytophthora kf requires the presence of opposite mating types known as A1 and A2. 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.

Disease symptoms “This disease occurs ko,eroga South West monsoon. Rain and wind are the two major factors in the epidemiology of Phytophthora fruit rot of papaya. Another symptom is the presence of cankers which are found in red maple, papaya, rubbermangosand cacao. Aarecanut germinate directly in a nutrient medium by producing germ tubes that develop into mycelial masses. Butler[2] Phytophthora palmivora var. The leaves and bunches wither away soon.

Australian Plant Pathology Society, appsnet.

The Hindu : Sci Tech / Agriculture : Managing fruit rot disease of areca nut

Phytophthora Water mould plant pathogens and diseases Coconut palm diseases. The first appearance of the koleroga is on the nuts two or three weeks after rains begin. However, close planting of palms provides ideal conditions for disease spread. Each sporangium gives rise to zoospores after a few hours of their formation. Other means of cultural control for P. Mature zoospores can be induced to germinate by treatment with 0.

From Wikipedia, the free encyclopedia. Copper fungicides such as 0. However, light is not required for sporangia production on infected papaya fruit. Collar rots are found on citrus, mango, and black pepper infected with P.

Felty whitish mass of fungal mycelia soon cover the entire surface of the fallen nuts. During the corresponding period last year, the district received 2, Although the common name of Phytophthora palmivora is bud rot of palms, it affects many tropical plants and has a moderately broad host range. Favourable climate The severity, persistence and spread of fruit rot are related to the pattern of rain. The source of primary inoculum, are the sporangia produced by the perennating pathogen structures, the chlamydospores formed in the infected fallen nuts, and, probably, the zoospores produced by the perennating oospores.

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

Trees established with the virgin soil method in the replant fields produce fruit as abundantly as those growing in the first planting fields. Email will not be published required. Coleman [2] Phytophthora palmivora var. National Center for Biotechnology Information. Therefore, intermittent rains maintaining constant humidity in the atmosphere with alternating sunshine abundant light are more conducive for the rapid spread of Koleroga.


Mobility of zoospores of P. Brown Spot Disease of Maize: Orellana [2] Phytophthora palmivora var. The officer said the department kolerogx compile its data on Tuesday as it has sought details on the kolegoga of land affected from its taluk offices. Printable version Dec 31, 7: During rainy periods, chlamydospores in soil may arecqnut in water to produce sporangia and release zoospores. 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.

Techniques for controlling moisture include: Phytophthora root rot of papaya seedlings is most serious during rainy periods. During the onset of the rainy season, these structures are carried to young nuts by various agencies and germinate there upon causing primary infection.

Though the farmers did take up the first round of spraying in July, the disease could not be controlled, he said, adding that his own plantation was hit. It is essential to reduce the inoculums of the fungus and also check the incidence of other Phytophthora diseases like bud and crown rots, according to the scientist. Phyto-sanitary measures such as removal of all dried and infected bunch attached to the palm and collection and destruction of all shed nuts will prove to be rewarding.

For Mac, click the only mouse button and follow the same steps. According to the department, about 40, hectares in the district are under arecanut cultivation.

The virgin soil method has the advantages of being relatively inexpensive, very effective and nonhazardous.