Seasonal variation of thrips species in grapevine according to phenological stages and management systems

O objetivo deste trabalho foi avaliar a ocorrência de espécies de tripes em videira e a flutuação populacional, das espécies mais frequentes e abundantes, em diferentes fases fenológicas e sistemas de manejo. O experimento foi realizado em Petrolina, PE, em cinco parreirais – três da cultivar Sugraone (certificada, semiconvencional e convencional) e duas da cultivar Brasil (certificada e convencional). Foram coletadas folhas e inflorescências durante dois anos consecutivos (2008–2010), em 15 plantas. Foram realizadas análises de correlação entre as médias de infestação de tripes e os fatores meteorológicos temperatura, umidade relativa do ar e precipitação pluvial. O número médio de larvas e adultos de tripes foi comparado entre os sistemas de manejo e as fases fenológicas. Nas folhas, foram constatadas as espécies Heliothrips haemorrhoidalis, Retithrips syriacus, Selenothrips rubrocinctus, Frankliniella schultzei, Frankliniella sp. e Scolothrips sp., além de larvas de Aelothripidae. Nas inflorescências, foram identificadas apenas espécies de Thripidae, F. schultzei, F. brevicaulis, F. rodeos, F. gardeniae e Frankliniella sp. Não houve correlação de temperatura, umidade relativa e precipitação pluvial com o número médio de tripes. Existe um complexo de espécies de tripes na videira, e a fenologia da planta exerce influência na abundância desses insetos.The objective of this work was to evaluate the occurrence of thrips species and the population fluctuation, of the most frequent and abundant ones, in different management systems and phenological stages of grapevine. The experiment was carried out in Petrolina, PE, Brazil, in five vineyards – three with the cultivar Sugraone (certified, semi‑conventional, and conventional) and two with the cultivar Brasil (certified and conventional). Leaves and flowers were collected during two subsequent years (2008–2010) from 15 plants. Correlation analyses were performed between the means of thrips infestation and the meteorological variables temperature, relative humidity, and rainfall. The average number of larvae and adult thrips was compared between the management systems and phenological stage. The thrips species found on leaves were: Heliothrips haemorrhoidalis, Retithrips syriacus, Selenothrips rubrocinctus, Frankliniella schultzei, Frankliniella sp., and Scolothrips sp., as well as nymphs of Aelothripidae. On flowers, only the Thripidae species was found: F. schultzei, F. brevicaulis, F. rodeos, F. gardenia, and Frankliniella sp. There was no correlation betweentemperature, relative air humidity, and rainfall with the average number of thrips. There is a thrips speciescomplex on grapevine, and plant phenology affects the abundance of the insects