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.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.