Sequential sampling plan for the control of the mites Panonychus ulmi (Koch) and Tetranychus urticae Koch, on nectarines varo Armking

René Vargas M.1 y Fernando Rodríguez A.1

An enumerative sequential sampling was developed for the European red mite (P. ulmi) and twospotted mite (T. urticae), in nectarines varo Armking in the Aconcagua Valley. The species distribution pattern was expressed in terms of Taylor's power law. Limit mite densities levels had to be determined before a proper interval between treatment and non-treatment thresholds could be decided. The sequential sampling was validated with data from a conventional sampling of mites, with a fixed sample size. This sequential sampling provided a saving in time of up to 65%, compared with the conventional sampling, with comparable levels of precision and reliance.

1 Subestación Experimental Control Biológico La Cruz (INIA), Casilla 3, La Cruz, Chile.