Citation
Lim W.H., . Bunchy and malformed top of papaya cv. Eksotika caused by Thrips parvispinus and Cladosporium oxysporum. pp. 200-207. ISSN 0128-0686
Abstract
The cause of bunchy and malformed top of papaya cv. Eksotika was investigated. Inoculation studies showed that Thrips parvispinus through their feeding (scraping and sucking) on young developing leaves provided the infection site (the damaged tissues) for invasion by the normally saprophytic fungus Cladosporium oxysporum. The damaged leaf on expansion exhibited the typical malformed symptoms characterized by shattered and distorted leaf spots/streaks and shot-holes on the lamina. Thrips in the absence of C. oxysporum only caused slight mottling or streaking of the leaf without malformation while C. oxysporum without thrips could not cause infection. A field trial on chemical control showed that weekly fungicidal sprays of benomyl (0.05 percent a.i.) alternated with mancozeb (0.1 percent a.i.) provided very good control of bunchy/malformed top while only limited control was obtained with insecticidal sprays (decamethrin 0.003 percent a.i. and methamidophos 0.1 percent a.i.).
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Abstract
The cause of bunchy and malformed top of papaya cv. Eksotika was investigated. Inoculation studies showed that Thrips parvispinus through their feeding (scraping and sucking) on young developing leaves provided the infection site (the damaged tissues) for invasion by the normally saprophytic fungus Cladosporium oxysporum. The damaged leaf on expansion exhibited the typical malformed symptoms characterized by shattered and distorted leaf spots/streaks and shot-holes on the lamina. Thrips in the absence of C. oxysporum only caused slight mottling or streaking of the leaf without malformation while C. oxysporum without thrips could not cause infection. A field trial on chemical control showed that weekly fungicidal sprays of benomyl (0.05 percent a.i.) alternated with mancozeb (0.1 percent a.i.) provided very good control of bunchy/malformed top while only limited control was obtained with insecticidal sprays (decamethrin 0.003 percent a.i. and methamidophos 0.1 percent a.i.).
Additional Metadata
| Item Type: | Article |
|---|---|
| Additional Information: | 1 ill.; 6 col. plates; 3 tables; 6 ref. Summary (En Ms) |
| AGROVOC Term: | CARICA PAPAYA |
| AGROVOC Term: | THRIPS |
| AGROVOC Term: | CLADOSPORIUM |
| AGROVOC Term: | MALFORMACION/ HOJAS |
| AGROVOC Term: | INSECTICIDAS |
| AGROVOC Term: | BENOMILO |
| Depositing User: | Ms. Norfaezah Khomsan |
| Last Modified: | 24 Apr 2025 05:55 |
| URI: | http://webagris.upm.edu.my/id/eprint/19994 |
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