Affiliation:
1. Gulf Coast Research and Education Center, University of Florida, Wimauma, FL
2. Department of Entomology and Nematology, University of Florida, Gainesville, FL
Abstract
Abstract
Scirtothrips dorsalis Hood infest strawberry (Fragaria x ananassa Duchesne, Rosaceae) fields from nearby crop fields and surrounding vegetation and cause injury to plants by feeding on young leaf tissues. Greenhouse and field studies were conducted to determine the short-range movement of S. dorsalis to assess the risk of an early S. dorsalis population to spread to adjacent plants. In a greenhouse, 25 potted strawberry plants were arranged in two concentric rows around a central plant, where plants in inner rows were 20 cm, and those in the outer rows were 40 cm from the central plant. In the field, 20 strawberry plants were arranged in two beds (90 cm apart), ten in each bed, and five plants in each row, with plants 30 cm apart. White sticky cards were placed at 60–120 cm from the central plant. Fifty S. dorsalis adults were released on a centrally located plant, and the numbers of S. dorsalis adults and larvae and feeding injury were recorded for 9–17 d on adjacent plants and sticky cards. Results showed that significantly more S. dorsalis adults and larvae remained on the initially infested plant compared to adjacent plants, although few adults were found up to 120 cm on sticky cards. The rate of spread of feeding injury was low with slight bronzing injury (<10% injury) on adjacent plants by 14–17 d. Since most S. dorsalis remained on initially infested plants for at least 2 wk, it is feasible to delay management actions and ‘rescue’ plants around a plant with minor injury symptoms.
Funder
Florida Strawberry Research and Education Foundation
Florida Specialty Crop Block Grant Program
Publisher
Oxford University Press (OUP)
Subject
Insect Science,Ecology,Ecology, Evolution, Behavior and Systematics