Egg morphology and stages of embryonic development of the glassy-winged sharpshooter (Hemiptera

Cicadellidae)

Ali K. Al-Wahaibi, Joseph G. Morse

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The structure of the egg and embryonic developmental stages of glassy-winged sharpshooter, Homalodisca vitripernnis (Germar) (Hemiptera: Cicadellidae), an important vector of Xylella fastidiosa are described and illustrated. This sharpshooter has narrow, flattened elliptical eggs with the anterior end less broad and more pointed than the posterior end. The anterior portion of the egg contains a keel-shaped structure with a ridge that stretches backward for a short distance and then transforms into a groove stretching longitudinally along the ventral surface of the egg. The eggshell apparently has two layers: an outer shell layer that peels off easily when handling the egg, and an inner layer that appears intact, tighdy surrounding the yolk and other liquid contents of the egg. There were six discernible stages of embryonic development (195 h at 25°C) : an initial undifferentiated stage at 0-90 h, appearance of the head cap at 90-100 h, eye spot migration at 100-130 h, active physiological stage at 130-180 h, a head cap ballooning stage at 180-190 h, and emergence of the first-instar nymph at 185-195 h. It was found that the general structure of the egg and embryonic developmental stages are similar to that of odier cicadellids. However, the present work breaks down the embryonic development of leafhopper eggs into more stages dian previously described. The timing of H vitripernnis embryonic developmental stages could be used to improve the design of host-age effect experiments aimed at developing more efficient rearing mediods for egg parasitoids to be released for control of H. vitripernnis.

Original languageEnglish
Pages (from-to)241-248
Number of pages8
JournalAnnals of the Entomological Society of America
Volume102
Issue number2
DOIs
Publication statusPublished - Mar 2009

Fingerprint

Homalodisca vitripennis
Cicadellidae
Hemiptera
embryogenesis
developmental stages
Homalodisca
Xylella fastidiosa
egg shell
parasitoids
nymphs
eclosion
rearing
instars
eyes
liquids

Keywords

  • Biological control
  • Egg age
  • Egg parasitoids
  • Egg structure
  • Leafhoppers

ASJC Scopus subject areas

  • Insect Science

Cite this

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title = "Egg morphology and stages of embryonic development of the glassy-winged sharpshooter (Hemiptera: Cicadellidae)",
abstract = "The structure of the egg and embryonic developmental stages of glassy-winged sharpshooter, Homalodisca vitripernnis (Germar) (Hemiptera: Cicadellidae), an important vector of Xylella fastidiosa are described and illustrated. This sharpshooter has narrow, flattened elliptical eggs with the anterior end less broad and more pointed than the posterior end. The anterior portion of the egg contains a keel-shaped structure with a ridge that stretches backward for a short distance and then transforms into a groove stretching longitudinally along the ventral surface of the egg. The eggshell apparently has two layers: an outer shell layer that peels off easily when handling the egg, and an inner layer that appears intact, tighdy surrounding the yolk and other liquid contents of the egg. There were six discernible stages of embryonic development (195 h at 25°C) : an initial undifferentiated stage at 0-90 h, appearance of the head cap at 90-100 h, eye spot migration at 100-130 h, active physiological stage at 130-180 h, a head cap ballooning stage at 180-190 h, and emergence of the first-instar nymph at 185-195 h. It was found that the general structure of the egg and embryonic developmental stages are similar to that of odier cicadellids. However, the present work breaks down the embryonic development of leafhopper eggs into more stages dian previously described. The timing of H vitripernnis embryonic developmental stages could be used to improve the design of host-age effect experiments aimed at developing more efficient rearing mediods for egg parasitoids to be released for control of H. vitripernnis.",
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N2 - The structure of the egg and embryonic developmental stages of glassy-winged sharpshooter, Homalodisca vitripernnis (Germar) (Hemiptera: Cicadellidae), an important vector of Xylella fastidiosa are described and illustrated. This sharpshooter has narrow, flattened elliptical eggs with the anterior end less broad and more pointed than the posterior end. The anterior portion of the egg contains a keel-shaped structure with a ridge that stretches backward for a short distance and then transforms into a groove stretching longitudinally along the ventral surface of the egg. The eggshell apparently has two layers: an outer shell layer that peels off easily when handling the egg, and an inner layer that appears intact, tighdy surrounding the yolk and other liquid contents of the egg. There were six discernible stages of embryonic development (195 h at 25°C) : an initial undifferentiated stage at 0-90 h, appearance of the head cap at 90-100 h, eye spot migration at 100-130 h, active physiological stage at 130-180 h, a head cap ballooning stage at 180-190 h, and emergence of the first-instar nymph at 185-195 h. It was found that the general structure of the egg and embryonic developmental stages are similar to that of odier cicadellids. However, the present work breaks down the embryonic development of leafhopper eggs into more stages dian previously described. The timing of H vitripernnis embryonic developmental stages could be used to improve the design of host-age effect experiments aimed at developing more efficient rearing mediods for egg parasitoids to be released for control of H. vitripernnis.

AB - The structure of the egg and embryonic developmental stages of glassy-winged sharpshooter, Homalodisca vitripernnis (Germar) (Hemiptera: Cicadellidae), an important vector of Xylella fastidiosa are described and illustrated. This sharpshooter has narrow, flattened elliptical eggs with the anterior end less broad and more pointed than the posterior end. The anterior portion of the egg contains a keel-shaped structure with a ridge that stretches backward for a short distance and then transforms into a groove stretching longitudinally along the ventral surface of the egg. The eggshell apparently has two layers: an outer shell layer that peels off easily when handling the egg, and an inner layer that appears intact, tighdy surrounding the yolk and other liquid contents of the egg. There were six discernible stages of embryonic development (195 h at 25°C) : an initial undifferentiated stage at 0-90 h, appearance of the head cap at 90-100 h, eye spot migration at 100-130 h, active physiological stage at 130-180 h, a head cap ballooning stage at 180-190 h, and emergence of the first-instar nymph at 185-195 h. It was found that the general structure of the egg and embryonic developmental stages are similar to that of odier cicadellids. However, the present work breaks down the embryonic development of leafhopper eggs into more stages dian previously described. The timing of H vitripernnis embryonic developmental stages could be used to improve the design of host-age effect experiments aimed at developing more efficient rearing mediods for egg parasitoids to be released for control of H. vitripernnis.

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