Population changes of Tuta absoluta (Gelechiidae) and fruit loss estimates on three tomato cultivars in greenhouses in Biskra, Algeria

Abstract

The aim of this study was to monitor Tuta absoluta population development in greenhouse conditions on different tomato cultivars. All pest stages were present on all the cultivars. The development of T. absoluta was variable and depended both on temperature and tomato cultivar. Losses due to development of T. absoluta larvae on the fruit were estimated at 43.3% on cv. 'Sahara' , 3% on cv. 'Dawson' , and 17% on cv. 'Toufan' . Percentage of fruit losses was positively correlated with increase in number of larvae. The attacks were more severe during the spring period with rising temperatures. Strong applications of pesticides used to control various tomato pests resulted in absence of antagonists in the greenhouse. Cultivars 'Toufan' and 'Dawson' were less suitable for cultivation in conditions of heavy leaf miner infestation; this characteristic may be associated with other control methods to reduce plant damage.