Annals of the Entomological Society of America

Published by: Entomological Society of America

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Annals of the Entomological Society of America 97(6):1227-1232. 2004
doi: 10.1603/0013-8746(2004)097[1227:IDIMGL]2.0.CO;2

Instar Differences in Marmara gulosa (Lepidoptera: Gracillariidae)

Marta Guillén and John M. Heraty

Department of Entomology, University of California, Riverside, CA 92521

Abstract

The number of feeding instars of Marmara gulosa Guillén & Davis (Lepidoptera: Gracillariidae), a pest on citrus in the southwestern United States, was investigated from laboratory and field samples. Larvae passed through four to seven feeding instars before the final transitional and spinning instars. An influence of temperature on the number of feeding instars was observed, with low temperatures increasing the proportion of larvae with a higher number of instars. Characterization of instars by the width of the larval head capsule was attempted, and major differences in head capsule width were observed between the same instars of larvae passing through four, five, and six feeding instars. Growth ratios of head capsule width between successive instars were higher for larvae with fewer instars than for those with a higher number, and last feeding instars for each group reached a similar final size.

Received: January 26, 2004; Accepted: July 9, 2004

Keywords: peelminer, instars, citrus, head capsule width, temperature



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Fig. 1. Frequency distribution of head capsule width (millimeters) and number of feeding instars of field-collected M. gulosa developing on grapefruit (lines correspond to ranges and dots represent single measurement considered as outliers; smaller lines correspond to the average for each instar)

table

Table 1. Duration (days ± MSE [range]) (days) of larval feeding instars of M. gulosa on grapefruit at different temperatures in the laboratory

table

Table 2. Width of head capsules (days ± MSE [range]) (mm) of feeding instars of M. gulosadissected from complete mines in field collected fruit

table

Table 3. Growth ratios of head capsule width (mean ± SEM [95% confidence interval]) of M. gulosa larvae passing through four, five, six and seven feeding instars in field-collected fruit

Cited by

Marta Guillén, John M. Heraty, Alberto Urbaneja. (2007) Fecundity and Development ofCirrospilus coachellae (Hymenoptera: Eulophidae), a Parasitoid ofMarmara gulosa (Lepidoptera: Gracillariidae). Journal of Economic Entomology 100:3, 664-669
Online publication date: 1-Jun-2007.

Abstract & References : Full Text : PDF (100 KB) 

Toomas Esperk, Toomas Tammaru, Sören Nylin. (2007) Intraspecific Variability in Number of Larval Instars in Insects. Journal of Economic Entomology 100:3, 627-645
Online publication date: 1-Jun-2007.

Abstract & References : Full Text : PDF (159 KB) 

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