Tier I testing of Cry1Ab protein on Micraspis (Fab.) (Coleoptera: Coccinellidae) and evaluation of its functional response to different prey types
Issue Date
10-2011
Abstract
Micraspis discolor (Fab.) is a ubiquitous and abundant predaceous insect in corn fields. hazard from exposure to Cry1Ab protein was evaluated by laboratory toxicity test using both maximum hazard dose and functional response assays. Mortality resulting from exposure to Cry1Ab protein was evaluated using artificial diet assays. Larvae and adults of M. discolor did not exhibit significant mortality after treatment for 7 days with Cry1Ab protein with concentration 20x higher than the concentration of Cry1Ab found in Bt corn pollen. The functional response to different prey types was evaluated in the laboratory by offering to M. discolor, that has been fed with Bt corn pollen, corn leaf aphid Rhopalosiphum maidis Fitch and Asian corn borer Ostrinia furnacalis Guenee in varying numbers or densities. The type of functional response reflected in each set of predation was analyzed by logistic regression followed by curve fitting to model equation describing a particular type of functional response. M. discolor exhibited a Type III functional response to all prey types tested which remained unaltered after ingestion of Bt corn pollen. Attack rates for all prey types were density-dependent which is typical of a type III functional response.
Source or Periodical Title
Philippine Entomologist
ISSN
0048-3753
Volume
25
Issue
2
Page
122-130
Document Type
Article
Frequency
semi-annually
Physical Description
graphs ; tables
Language
English
Recommended Citation
Alcantara, Edwin P., "Tier I testing of Cry1Ab protein on Micraspis (Fab.) (Coleoptera: Coccinellidae) and evaluation of its functional response to different prey types" (2011). Journal Article. 5205.
https://www.ukdr.uplb.edu.ph/journal-articles/5205
En – AGROVOC descriptors
COLEOPTERA; COCCINELLIDAE; BACILLUS THURINGIENS; PLANT PESTS; TESTING; EVALUATION; ACUTE TOXICITY; PEST RESISTANCE