ISHS Acta Horticulturae 422: International Conference on Integrated Fruit Production
PREDATORS OF CACOPSYLLA PYRI IN NE SPAIN. HETEROPTERA: ANTHOCORIDAE AND MIRIDAE |
| Authors: | M. Artigues, J. Avilla, A.M. Jauset, M.J. Sarasúa |
| Abstract:
Since 1990 we have been monitoring the populations of pear pests and beneficials in a commercial orchard free from pesticides. The Heteroptera, Anthocoridae and Miridae, were the predators whose populations were more related to the dynamics of Cacopsylla pyri populations. Within the Anthocoridae, Anthocoris nemoralis was able to respond to psylla outbreaks, with a stronger response when the outbreak was in summer than when it was in autumn. The group of Orius species was more constant in numbers and as abundant as A. nemoralis the years without psylla outbreaks. The Miridae appeared every year earlier than the Anthocoridae and in numbers related to the psylla population from the previous year. The years with the higher initial numbers of Miridae showed the lower peaks of psylla. Although these predators are polyphagous, as are the Orius species, their populations were more related to the psylla fluctuations. These relationship can clearly be seen in Pilophorus perplexus, the species that could be identified every year in all its stages. | |
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