Field trials on mating disruption to control the European grape moth Eupoecilia ambiguella Hbn.
1993
Vogt, H. (Biologische Bundesanstalt fuer Land und Forstwirtschaft, Dossenheim (Germany). Inst. fuer Pfanzenschutz im Obstbau) | Schropp, A. | Neumann, U. | Eichhorn, K.W.
In 1984 and 1985 field trials on mating disruption of the European grape moth Eupoecilia ambiguella Hbn. were carried out on a large scale (117 ha) in the vine growing region of Rhine-Palatinate. The pheromone quantities used varied between 25 and 150 g Z-9-DDA (2.6 % E) per hectare, the number of pheromone sources (HERCON Dispensers) from 50 to 1000/ha and 10 000/ha (application by helicopter). Efficiency was checked with different methods: disorientation of male moths using pheromone traps, mating reduction by dissection of female moths caught in bait traps, damage assessment. Disorientation always amounted to more than 99 %. Damage assessment revealed different levels of efficiency depending on the site of the treated plots: whereas in areas with low or moderate insect population good results were obtained with 25 g pheromone and 180 sources/ha, this treatment, however, failed in plots with high population pressure. By increasing the pheromone quantity and/or the number of sources per hectare, larval attack was reduced below the damage threshold in these areas with only few exceptions. The percentage of unmated females amounted to 83 % in the pheromone treated versus 13 % in untreated. These results were obtained by applying the pheromone dispensers by hand. The application of miniflakes by helicopter was not successful. Since 1986 the mating disruption technique for control of E. ambiguella has been registered in Germany: at first against the 2nd generation with a recommended dosage of 50 g Z-9-DDA/ha and 500 sources, since 1991 against both generations, recommending one application of 170 g Z-9-DDA/ha and 500 sources. In areas with high population densities, these have to be reduced by specific control measures prior to the use of the mating disruption technique.
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