PDF | Papaya is an important export crop in Cuba. A disease named Bunchy top symptom (BTS) was first observed in from Villa Clara. Initial symptoms include diffuse chlorosis in young leaves accompanied by a reduction in normal leaf blade expansion, and petiole and internode elongation. Transmission of the Bunchy Top Disease of Papaya (Carica papaya L.) by the Leaf Hopper Empoasca papayae Oman. By FRANCISCO SEÍN JR., JOSÉ.

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Flowering and fruit set rarely occur in affected plants. Plants showing the symptoms, bunchy and malformed tops, were slow to recover, and had almost no yield if infection occurred before fruiting. Symptoms and their rate of development, however, are variable, and severity of symptom expression may be affected by host genotype.

Fruit production almost stopped, and what did ripen was so low in sugar as to be uninteresting. Contact Us Member Options. Keep Me Signed In. Yong Lee Ming at the Tenom agriculture experiment station in Malaysia sent us some fresh seed, and some important information. The American Bucnhy Society. Jensen reported that as many as two-thirds of the plants in some plantings in Puerto Rico can be diseased, that few fruit set, and that those fruit that set are tasteless. I guess this is a living example of how languages change.

The Tpo Tropical Agriculture Development: However, much of the confusion regarding the etiology and diagnosis of bunchy top disease may have been due to the misidentification of degenerating latex vesicles as phytoplasmas Davis et al. Close Find out papayw. Forgot your password Register.

Bunchy Top on Papaya |

ECHO exists to reduce hunger and improve lives through agricultural training and resources. Bunchy Top on Papaya. Latex flow from wounds is absent or retarded in infected parts of trees, and therefore infected treetops should be removed at a point below where latex begins to freely flow upon wounding. Presently, there are no widely recommended control measures for papaya bunchy top. Orphaned articles from December All orphaned articles.


Substantial host resistance has not been found, although some varieties are more tolerant of the disease than others.

Tolerant papaya cultivars to Bunchy Top Disease have been found and bred to help stop the spread of disease. Views Read Edit View history. Bacterial plant pathogens and diseases Papaya tree diseases. In advanced stages the plants become denuded except for a tuft of small leaves at the apex.

By using this site, you agree to the Terms of Use and Privacy Policy. From Wikipedia, the free encyclopedia. Webb and Davis questioned the reliability of the latex-flow test for diagnosis of PBT because bodies resembling phytoplasmas were observed by transmission electron microscopy in samples from symptomatic plants that exhibited a normal flow of latex upon wounding. Buncyy going on right now: Bonnie and I much prefer its flavor to any of the other solo papaya cultivars.

Retrieved from ” https: Papaya bunchy top is a major limiting factor in papaya production in some areas of the Caribbean region. Comments 0 You must be signed in to comment Sign in or Register. The absence of latex exuding from fresh wounds of affected tissues is considered characteristic of the disease but is also symptomatic of two other papaya diseases of phytoplasma etiology in Australia referred to as mosaic Simmonds, and dieback Harding and Teakle, Control of thrips with insecticide was partially effective, too not recommended.

Papaya is the only known host of the disease. This is to ensure that we give you the best experience possible. Additional Recommended Resources Loading Please introduce links to this eh from related articles ; try the Find link tool for suggestions. The symptom you described appears to be similar to what we have in Malaysia, but so far is not a big problem and often easily controlled.


The cultivar exsotica developed for its disease resistance was more susceptible than some other Malaysian cultivars. We cut the trees and have replanted. These resources include a vast knowledgebase of practical information, experienced technical support and an extensive seed bank focused on highly beneficial underutilized plants.

Papaya Bunchy Top Disease

Like most websites we use cookies. Cookies on Plantwise Knowledge Bank Like most websites we use cookies. Surgical removal of infected treetops combined with sprays to control insect vectors was recommended for control of bunchy top in the past; however, the insecticide used at that time is no longer permitted.

This article is an orphanas no other articles link to it. Knowledge Bank home Change location. It is believed that the thrips are pollinating agents as well; inadequate pollination in papaya may lead to premature fruit drop and reduced fruit size. Initial symptoms include diffuse chlorosis in young leaves accompanied by a reduction in normal leaf blade expansion, and petiole and internode elongation Jensen, ; Davis, ; Davis et al.

Rickettsia causes diseases in animals, such as typhus and spotted fever, [2] as well as in other plants, such as phony disease of peach and almond leaf scorch. For a small packet of Dr. Petioles are rigid, extending more horizontally from the main stem than normal.