Biochemical changes during the development of witches’ broom: the most important disease of cocoa in Brazil caused by Crinipellis perniciosa. Scarpari LM(1). Crinipellis perniciosa is the cause of witches’ broom disease of cocoa, a serious problem in South America. The aim of the project was to develop a measure of. Pulse-field gel electrophoresis (PFGE) was used to determine the genome size and characterize karyotypic differences in isolates of the cacao biotype of.
|Published (Last):||9 July 2007|
|PDF File Size:||20.19 Mb|
|ePub File Size:||5.49 Mb|
|Price:||Free* [*Free Regsitration Required]|
The lesion arising from an infection from P.
Under experimental conditions, this biotype is also able to cause witches’ broom symptoms on tomato, aubergine, potato, pepper and potato.
Early results are encouraging, and indicate that about years are required for the two recommended rehabilitation pruning methods. Two strategies for developing economically effective fungicide control may be viable. This mycelium colonizes the various parenchymatous tissues of the broom but to different extents.
Moniliophthora perniciosa – Wikipedia
With the production losses associated with WBD, tropical landowners are forced to convert their drinipellis to other production systems that usually require the destruction of the forest cover.
More Spanish version Dr.
Chlorophylls a and b were lower throughout the development of the disease while carotenoids and xanthophylls dropped in the infected tissue by the time of symptom development. Hypertrophied fruit infected when young become carrot shaped top.
Culture extracts of certain antagonistic fungi have been shown to have inhibitory activity against basidiospore germination and saprophytic growth of M. A review of the research on chemical control of witches’ broom pernuciosa of cocoa. Phytosanitation methods need to be qualified where the amount of pod loss to witches’ broom does not justify action to control the disease. Crinipellis perniciosa Stahel Singer, Lilloa 8: The dose, interval and number of crinipelli have all been found to affect activity.
There was a problem providing the content you requested
Obligate or homotypic synonyms: If witches’ broom is controlled, then other pod diseases in the plantation must also be taken into consideration or their incidence may increase, thereby reducing the economic benefit of successful witches’ broom control Rudgard et al. Revista Theobroma, 13 crinipellie Elimination of the diseased tissues from the plantation after pruning is optional in some circumstances but necessary in others. Moniliophthora perniciosa Scientific classification Kingdom: Introduction will only occur through the movement of diseased cocoa material which is then able to produce basidiomata sufficiently close to a cocoa-growing area to allow infection.
The beneficial effects of such practices on yield and the time taken for recovery have only been partially investigated.
The biotrophic stage, and what triggers its switch to a saprotrophic stage, are still not understood. Ethylene levels are hypothesized to play a key role in broom development.
Young flushes, particularly the developing buds, are most susceptible. Breeding for witches’ broom resistance was subsequently started in other countries, often following further searches for germoplasm, for example, the programme at the Tropical Experiment Station, Pichilingue, with material collected by Desrosiers and von Buchwald. Transactions of the British Mycological Society, 74 3: Cocoa has a very different spatial arrangement of spray targets to the majority of crops, and spray equipment typically used on cocoa has been developed for general purposes and does not suit cocoa.
Crunipellis of the 10th International Cocoa Research Conference. Proceedings of the 9th International Cocoa Research Conference. There are various classic symptoms in infected fruit, which may occur in several combinations. In addition to earlier work, a major international study in the late s provided data for describing and analysing witches’ broom epidemics in all the major cocoa-producing regions where the disease was found at that time.
Where xrinipellis is regular, pruned tissues can be left in the plantation, provided that removed diseased material should not be heaped or left uncovered on the ground in plantations, and leaf-litter should be allowed to accumulate naturally, or should be placed over the removed diseased material.
International witches’ broom project.
These factors lead to loss or dilution of any active ingredient and result in the breakdown of disease control. Distribution Maps Top of page You can pan and zoom the map. Four discrete biotypes have been recognized, each with different pathogenicities; those associated with cocoa and related hosts C-biotype ; species of Solanum S-biotype ; Bixa B-biotype ; and the liana biotype L-biotype Griffith and Hedger, The most important pefniciosa is the phenology of the recuperating trees and the microclimate to which the regenerating trees will be exposed.
Annals of Applied Biology, 89 2: Rudgard SA; Crinipelliw T, Prediction of any reductions in pod losses is more difficult criniepllis a sanitized field of cocoa surrounded by continuous plantations where brooms are not removed.