Population dynamics of rice leaffolders (Lepidoptera: Pyralidae) and their natural enemies in irrigated rice in the Philippines
Populations of rice leaffolders and their natural enemies were studied in eight crops of irrigated rice in Laguna Province, the Philippines. The rice leaffolder complex consisted of three species: Cnaphalocrocis medinalis (Guenée), Marasmia patnalis Bradley and M. exigua Butler. Leaffolder populatio...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Cambridge University Press
1999
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/166468 |
| _version_ | 1855542407038238720 |
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| author | Kraker, J. de. Huis, A. van Heong, K.L. van Lenteren, J.C. Rabbinge, R. |
| author_browse | Heong, K.L. Huis, A. van Kraker, J. de. Rabbinge, R. van Lenteren, J.C. |
| author_facet | Kraker, J. de. Huis, A. van Heong, K.L. van Lenteren, J.C. Rabbinge, R. |
| author_sort | Kraker, J. de. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Populations of rice leaffolders and their natural enemies were studied in eight crops of irrigated rice in Laguna Province, the Philippines. The rice leaffolder complex consisted of three species: Cnaphalocrocis medinalis (Guenée), Marasmia patnalis Bradley and M. exigua Butler. Leaffolder population dynamics were characterized by an egg peak at maximum tillering and a broad larval peak around booting stage. Peak densities ranged from 0.2 to 2.0 larvae per hill. Most larvae originated from immigrant moths and there was no substantial second generation. The seasonal percentage egg parasitism by Trichogramma sp. ranged from 0 to 27%, and percentage larval parasitism from 14 to 56%. The braconid Macrocentrus philippinensis Ashmead was the most commonly reared larval parasitoid. Forty natural enemy taxa that may attack rice leaffolders were identified from suction and sweepnet samples: 24 predator taxa and 16 parasitoid taxa. The estimated survival rates from leaffolder egg to larval stages and between larval stages showed large variation between rice crops, but were not clearly correlated with observed levels of parasitism, natural enemy abundance, or natural enemy to leaffolder ratios. It is suggested that the generally low densities of rice leaffolders in Philippine transplanted rice are caused by their ovipositional preference for crops at the maximum tillering stage, allowing for only one generation, and by high immature mortality caused by the abundant and diverse complex of natural enemies. |
| format | Journal Article |
| id | CGSpace166468 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1999 |
| publishDateRange | 1999 |
| publishDateSort | 1999 |
| publisher | Cambridge University Press |
| publisherStr | Cambridge University Press |
| record_format | dspace |
| spelling | CGSpace1664682025-05-14T10:40:02Z Population dynamics of rice leaffolders (Lepidoptera: Pyralidae) and their natural enemies in irrigated rice in the Philippines Kraker, J. de. Huis, A. van Heong, K.L. van Lenteren, J.C. Rabbinge, R. leaffolders cnaphalocrocis medinalis marasmia patnalis population dynamics natural enemies parasitism Populations of rice leaffolders and their natural enemies were studied in eight crops of irrigated rice in Laguna Province, the Philippines. The rice leaffolder complex consisted of three species: Cnaphalocrocis medinalis (Guenée), Marasmia patnalis Bradley and M. exigua Butler. Leaffolder population dynamics were characterized by an egg peak at maximum tillering and a broad larval peak around booting stage. Peak densities ranged from 0.2 to 2.0 larvae per hill. Most larvae originated from immigrant moths and there was no substantial second generation. The seasonal percentage egg parasitism by Trichogramma sp. ranged from 0 to 27%, and percentage larval parasitism from 14 to 56%. The braconid Macrocentrus philippinensis Ashmead was the most commonly reared larval parasitoid. Forty natural enemy taxa that may attack rice leaffolders were identified from suction and sweepnet samples: 24 predator taxa and 16 parasitoid taxa. The estimated survival rates from leaffolder egg to larval stages and between larval stages showed large variation between rice crops, but were not clearly correlated with observed levels of parasitism, natural enemy abundance, or natural enemy to leaffolder ratios. It is suggested that the generally low densities of rice leaffolders in Philippine transplanted rice are caused by their ovipositional preference for crops at the maximum tillering stage, allowing for only one generation, and by high immature mortality caused by the abundant and diverse complex of natural enemies. 1999-05 2024-12-19T12:56:17Z 2024-12-19T12:56:17Z Journal Article https://hdl.handle.net/10568/166468 en Cambridge University Press de Kraker, J.; van Huis, A.; Heong, K.L.; van Lenteren, J.C. and Rabbinge, R. 1999. Population dynamics of rice leaffolders (Lepidoptera: Pyralidae) and their natural enemies in irrigated rice in the Philippines. Bull. Entomol. Res., Volume 89 no. 5 p. 411-421 |
| spellingShingle | leaffolders cnaphalocrocis medinalis marasmia patnalis population dynamics natural enemies parasitism Kraker, J. de. Huis, A. van Heong, K.L. van Lenteren, J.C. Rabbinge, R. Population dynamics of rice leaffolders (Lepidoptera: Pyralidae) and their natural enemies in irrigated rice in the Philippines |
| title | Population dynamics of rice leaffolders (Lepidoptera: Pyralidae) and their natural enemies in irrigated rice in the Philippines |
| title_full | Population dynamics of rice leaffolders (Lepidoptera: Pyralidae) and their natural enemies in irrigated rice in the Philippines |
| title_fullStr | Population dynamics of rice leaffolders (Lepidoptera: Pyralidae) and their natural enemies in irrigated rice in the Philippines |
| title_full_unstemmed | Population dynamics of rice leaffolders (Lepidoptera: Pyralidae) and their natural enemies in irrigated rice in the Philippines |
| title_short | Population dynamics of rice leaffolders (Lepidoptera: Pyralidae) and their natural enemies in irrigated rice in the Philippines |
| title_sort | population dynamics of rice leaffolders lepidoptera pyralidae and their natural enemies in irrigated rice in the philippines |
| topic | leaffolders cnaphalocrocis medinalis marasmia patnalis population dynamics natural enemies parasitism |
| url | https://hdl.handle.net/10568/166468 |
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