Spatial distribution and control levels of Anastrepha spp. (Diptera: Tephritidae) in guava orchards

Abstract

This study aimed to know the patterns of spatial distribution of Anastrepha spp. and establish a criterion for determining the appropriate time for pest control. For this, 90 McPhail traps were used as Sampling Units (SU) divided into three commercial orchards of Novo Milênio guava with a total area of 14 ha. Traps were interspersed between the rows of plants, systematically in the orchards, hung and baited with 5% hydrolyzed corn protein with weekly collections. We caught 8,170 Anastrepha spp. in 840 SU. The mean infestation index was compared to the three types of distribution: random, uniform, aggregate, and fit by the theoretical frequency distributions of Poisson, negative binomial and positive binomial. The populations of Anastrepha presented aggregate distribution according to the mean variance method (I), tested by distance from randomness. The economic damage risk potential of Anastrepha spp. was associated with the aggregate distribution behavior. The most appropriate moment for the use of control techniques is when reaching 20 flies by the negative binomial. On the other hand, number of fruit fly adults per trap per day (FTD), underestimates population index, which will allow population growth, leading to risk of crop production loss.

Spatio-temporal distribution, diversity and monitoring of fruit flies (Diptera, Tephritidae) in papaya orchards in the state of Espírito Santo, Brazil

“…In addition, the analysis taking into account the frequency distribution of the fruit flies confirmed the suitability of the negative binomial model for all scenarios analyzed (different periods: 1998 to 2003, 2004 to 2010, and different areas: full area, buffer zone, and neighborhoods 1 and 2). Insect count data are generally not distributed (Sileshi, 2006), and there is evidence showing that the frequency distribution in this taxonomic group is ecologically described by a negative binomial distribution Maldonado et al, 2016;Nicácio et al, 2019). This function characterized by variance significantly higher than the mean , was observed in our results.…”

“…In Brazil, several studies have been conducted in agricultural areas (Uramoto and Martins, 2006;Nicácio et al, 2019;Ramos et al, 2019). However, studies describing the ecological patterns of these insects in heterogeneous environments are still scarce.…”

“…Spatio-temporal patterns of distribution in fruit flies have been investigated using different statistical tools such as geostatistics and exponential family models to investigate the frequency distribution of species and populations Nicácio et al, 2019;. These include Poisson and negative binomial functions, usually employed to investigate random and clumped ecological distribution patterns.…”

Distribution and Host Selection of Tropical Rat Mite, Ornithonyssus bacoti, in Yunnan Province of Southwest China

“…The measurement of spatial distribution pattern of a certain population is one of important issues in arthropod ecology [ 69 , 70 ]. There are usually three types of spatial distribution patterns: uniform (or even) distribution, random distribution and aggregated distribution [ 52 , 71 , 72 , 73 ]. There are a variety of statistical methods to measure the spatial distribution pattern of a certain population, and the patchiness index and Taylor’s power law are two of them [ 43 , 44 , 74 ].…”

“…The aggregated distribution pattern of O. bacoti in the present study is consistent with that of some other ectoparasites, such as chigger mites; this is a common phenomenon in many parasites [ 38 , 52 , 71 ]. The aggregated distribution may be beneficial to the survival, mating and defense of the parasites [ 4 , 38 , 72 , 73 ].…”