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Natural history of Symmetrischema lavernella (Lepidoptera: Gelechiidae): a moth with two feeding strategies and the ability to induce fruit formation in the absence of pollination

Published online by Cambridge University Press:  06 January 2017

T’ai H. Roulston ,
Stephanie Cruz-Maysonet ,
Amy L. Moorhouse ,
Sangmi Lee  and
Amber N. Emerson
T’ai H. Roulston*
Affiliation:
Department of Environmental Sciences, University of Virginia, Charlottesville, Virginia, 22904-4123, United States of America Blandy Experimental Farm, Boyce, Virginia, 22620, United States of America
Stephanie Cruz-Maysonet
Affiliation:
Department of Environmental Sciences, University of Virginia, Charlottesville, Virginia, 22904-4123, United States of America Blandy Experimental Farm, Boyce, Virginia, 22620, United States of America
Amy L. Moorhouse
Affiliation:
Department of Biology, Minnesota State University Moorhead, Moorhead, Minnesota, 56563, United States of America
Sangmi Lee
Affiliation:
Hasbrouck Insect Collection, School of Life Sciences, Arizona State University, Tempe, Arizona, 85287-4501, United States of America
Amber N. Emerson
Affiliation:
Department of Biology, Howard University, Washington, District of Columbia, 20059, United States of America
*
4Corresponding author (e-mail: [email protected]).
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Abstract

The moth Symmetrischema lavernella (Chambers) (Lepidoptera: Gelechiidae) has two feeding strategies on its host plant Physalis Linnaeus (Solanaceae): a fruitworm that feeds on developing ovules in a fruit and a budworm that consumes a floral bud. The fruitworm strategy occurs when a neonate caterpillar enters the ovary of a flower bud above a size threshold (~4 mm in Physalis heterophylla Nees), consumes the developing ovules, and pupates in the fruit. In P. heterophylla, occupancy of the ovary by S. lavernella causes fruit development to occur in the absence of pollination, indicating that the caterpillar initiates developmental pathways associated with pollination. The budworm strategy occurs in buds below ~4 mm, involves consumption of the ovary and immature anthers, and results in pupation inside the uninflated calyx. The two strategies co-occur on plants, determined by the sizes of the available buds at the time of oviposition. The most prominent natural enemy of S. lavernella using the fruitworm strategy was the frugivorous caterpillar Heliothis subflexa (Guenée) (Lepidoptera: Noctuidae), also a specialist of Physalis. The larger Heliothis subflexa feeds on the fruit externally, consumes S. lavernella, and caused 31.3% of fruitworm mortality in field surveys. Parasitoids included wasps (Hymenoptera) of the families Braconidae, Ichneumonidae, and Chalcididae.

Type
Behaviour & Ecology
Information
The Canadian Entomologist , Volume 149 , Issue 3 , June 2017 , pp. 326 - 337
Copyright
© Entomological Society of Canada 2017 

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Footnotes

1

Present address: Department of Sociology and Anthropology, University of Puerto Rico, Río Piedras, San Juan, PR 00931, Puerto Rico

2

Present address: Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, Iowa, 50011, United States of America

3

Present address: Houston Independent School District, Houston, Texas, 77092-8501, United States of America

Subject editor: Chris Schmidt

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