Phytoparasitica (1997) 25, p. 164 (Nestel et al.)

D. Nestel and M. Klein (1997)
Colonization and spread of leafhoppers in deciduous orchards
Phytoparasitica 25 (2), 164-164
10th Conference of the Entomological Society of Israel, February 11, 1997, Bet Dagan, Israel, lecture
Abstract: We investigated the spatio-temporal dispersion patterns of adult leafhoppers in apple and nectarine orchards. Adult leafhoppers were sampled weekly in the two types of orchards with a rectangular grid of yellow boards. No leafhoppers were trapped during the winter and early spring months. Both Asymmetrasca decedens and Edwardsiana rosae colonized the orchards following the blooming of trees. The two species were abundant in the apple orchard and produced two generations inside the orchard, whereas only the former species was abundant in the nectarine orchard. Geostatistical analysis of the leafhopper's spatial patterns showed that the two species aggregate at the edge of the orchards during the colonization wave. The spatial pattern of A. decedens changed from aggregated to random with each successive generation, while E. rosae maintained an aggregated pattern during the entire season. It seems that the change in the spatial pattern of A. decedens is related to the spread of the population with each reproductive pulse. The maintenance of aggregation in E. rosae seems to be related to both the outward spread of the population with each successive reproductive pulse and the successive colonization waves from the surrounding environment. It is proposed that the edge-aggregation of adult leafhoppers during their colonization of orchards could be used against these pests. An example of this was discussed.
Database assignments for author(s): David Nestel

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
environment - cropping system/rotation

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Edwardsiana rosae	Apple (Malus)	Israel
	Asymmetrasca decedens	Apple (Malus)	Israel
	Asymmetrasca decedens	Peach/nectarine (Prunus persica)	Israel