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- Briggs, C.J., et al. Show all 3 Authors
- Biological control 2007 v.43 no.3 pp. 257-264
- Cacopsylla pyricola; population density; population growth; nitrogen fertilizers; fertilizer rates; Pyrus communis; pears; plant growth; nitrogen content; predatory insects; natural enemies; Anthocoris nemoralis; predation; biological control agents; tritrophic interactions; insect control
- ... Herbivore population dynamics are governed both by bottom-up (plant-mediated) and by top-down (natural enemy-mediated) processes, with the potential for interaction between them. Pear psylla (Cacopsylla pyricola Foërster) is a phytophagous pest in pear orchards. Pear psylla is commonly attacked by several different natural enemies, but it may escape control, especially if fertilizer additions and ...
- Briggs, C.J., et al. Show all 2 Author
- Ecological entomology 1996 v.21 no.2 pp. 128-140
- parasitism; parasitoids; Rhopalomyia californica; host-parasite relationships; models; duration; interspecific competition; population density; biological resistance; galls; California
- ... The length of time that a gall-forming midge, Rhopalomyia californica, was vulnerable to attack by four parasitoid species was measured in the field at two locations. The midge had a restricted window of vulnerability to each of the parasitoid species, but similar windows of vulnerability were found at the two sites. A stage-structured model was used to illustrate that the length of the vulnerable ...