Distribuição espacial e plano de amostragem das moscas das frutas Anastrepha e Ceratitis capitata (Diptera: tephritidae) em pomares de goiaba

Abstract

The fruit flies are barriers to global fruit production. knowledge of the spatial distribution of populations of Anastrepha and Ceratitis capitata is important to monitoramente maintain the number density of these insects in the lower level of economic damage. It is effective when accompanied by frequency distribution to estimate quickly and accurately the population density for producer have saved time and inputs. The objectives of this study were (i) to assess the infestation to build a sequential sampling plan Anastrepha and C. capitata with use of McPhail trap in guava new millennium orchard; (ii) to elucidate the spatial distribution patterns of the flies and build a field sheet; (iii) determine the expected size of the sample and the sample units the number of flies captured by (mad) and the type of spatial distribution of Anastrepha for decision making. They used 30 attractive McPhail traps corn hydrolyzed protein to 5%, installed in three locations with guava new millennium, with weekly collections. collected is 8.170 Anastrepha spp. in 840 sampling units (repetitions = AU), and. 11.617 C. capitata 1110 AU was found that the Anastrepha and C. capitata clumped available, set the negative binomial distribution. This aggregation behavior promotes the risk of potential harm, and the beginning of this distribution indicates the most appropriate time for the use of control techniques. For the mad index underestimates this population index, leading to risk of loss of crop production. For sampling plan was used sequential test likelihood ratio (TSRP), averaging 0.3 flies to the security level and 0.7 for the action, fit the negative binomial (BN) to the equation straight. the lines of top decision recommended control is s1 = 6.5524 + 0,5362n and s1 = 6,005 + 0,4644n, and the bottom does not recommend control employment, defined by so = -2.8229 + 0,5362n and so = -2.5870 + 0,4644n, and the sequential plan indicated the expected maximum number of 37 and 18 au for Anastrepha and C. capitata, respectively, to define whether or not the control method of use, with safety limit defined on average 0.5 individual Anastrepha spp. and C. capitata per sample unit.