A Study On Proxenus Hennia Swinhoe And Nymphula Responsalis Walker As Potential Biological Control Agents Of Water Lettuce (Pistia Stratiotes L.)
| dc.contributor.author | KASNO | |
| dc.date.accessioned | 2016-11-15T08:19:04Z | |
| dc.date.available | 2016-11-15T08:19:04Z | |
| dc.date.issued | 1982-07 | |
| dc.description.abstract | A search for arthropods attacking water lettuce (Pistia stratiotes L.) was carried out, at some locations on Penang Island and Kuala Kedah, Malaysia The objective of the search was to look for appropriate candidate biological control agents of this aquatic weed. Several arthropods were found attacking the weed, amongst them, were Proxenus hennia Swinhoe (Lepidoptera: Noctuidae) ,and Nymphula responsalis Wlk. (Lepidoptera: Pyralidae)~ both of which were selected for further studies. The life histories and the possible use of P. hennia and N. responsalis as biological control agents of water lettuce were studied under laboratory conditions. The complete life cycle of P. hennia took 2S.53 + 1.65 days of which 1S.S0 + 1.45 days were destructive to Pistia stratiotes. The complete life cycle of N. responsalis was 32.92 ~ 1.44 days of which 23.04 ~ 1.31 days were destructive. Under controlled conditions the adult female of P.hennia produced 620 eggs with 70 percent survival to the pupal stage and N. respqnsalis produces 320 eggs with SO percent survival to the pupal stage. However, under field conditions the populations of P. hennia and N. responsalis were generally low: indicating that natural factors have an important role, in their respective ability to survive. Therefore, these factors need to be studied further, e.g. predators, parasites and climate. Studies on damage potential of the insects to water lettuce were carried out; two or three larvae of either or both of the insects cause significant decrease in the growth of water lettuce plants having a crown diameter of 8 - 10 cm. Besides the high damage potential of the insects to the weed, P. hennia is monophagous on water lettuce, whilst N. responsalis is oligophagous, the larvae feeding on seeral non-economic aquatic plants, such as Salvinia cucullata Roxb. ex Bory, Azolla pinnata R.Br., Lemna minor Auct., Eichhornia crassipes (Mart.) Solms, Limnocharis flava (L.) Buch., as well and economic terrestrial plant Colocasia esculenta (L.) Schott. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/3086 | |
| dc.subject | A Study On Proxenus Hennia Swinhoe And Nymphula Responsalis Walker | en_US |
| dc.subject | As Potential Biological Control Agents Of Water Lettuce (Pistia Stratiotes L.) | en_US |
| dc.title | A Study On Proxenus Hennia Swinhoe And Nymphula Responsalis Walker As Potential Biological Control Agents Of Water Lettuce (Pistia Stratiotes L.) | en_US |
| dc.type | Thesis | en_US |
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