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Reproductive biology of the female H...

Hummel, Natalie Anne.

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Reproductive biology of the female Homalodisca coagulata (Say) (Hemiptera: Cicadellidae).

Record Type:	Electronic resources : Monograph/item
Title/Author:	Reproductive biology of the female Homalodisca coagulata (Say) (Hemiptera: Cicadellidae)./
Author:	Hummel, Natalie Anne.
Description:	136 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-10, Section: B, page: 5206.
Contained By:	Dissertation Abstracts International66-10B.
Subject:	Biology, Entomology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3191134
ISBN:	9780542346545

Reproductive biology of the female Homalodisca coagulata (Say) (Hemiptera: Cicadellidae).
Hummel, Natalie Anne.

Reproductive biology of the female Homalodisca coagulata (Say) (Hemiptera: Cicadellidae). - 136 p.

Source: Dissertation Abstracts International, Volume: 66-10, Section: B, page: 5206.

Thesis (Ph.D.)--University of California, Davis, 2005.

The functional reproductive morphology of the female glassy-winged sharpshooter, Homalodisca coagulata (Say), is described at both light and scanning electron microscopy levels. The female has nine abdominal segments with the ninth modified as the pygofer. There are three pairs of valvulae and two pairs of valvifers. The pygofer, valvulae and valvifers bear many sensillae. The first and second valvulae function together for oviposition which is facilitated by seven major muscles. The oviposition process is described with respect to the activity of the valvulae and their associated musculature. The reproductive organs of H. coagulata consist of one pair of ovaries, paired lateral oviducts, a common oviduct, a spermatheca, an enlarged genital duct, a complex bursa copulatrix, a vagina, two types of accessory glands, and a genital chamber. To study the reproductive patterns, female H. coagulata were collected from October 2001 to February 2005 from citrus at the University of California, Riverside. Between five and twenty females per sampling date were dissected, and each was assigned an ovarian rank: previtellogenic, vitellogenic, or postvitellogenic. Based on the stage of oocyte development, a set of morphological criteria was selected to evaluate the rank of ovarian development for field-collected specimens. A principal component analysis found that the ovarian ranks were grouped according to reproductive status of the females. These dissections revealed that there are two distinct generations annually, with an occasional third generation. A step-wise regression model of H. coagulata vitellogenesis cycles in southern California was developed which predicts the appearance of subsequent generations based on oviposition activity. Finally, we examined the effect of host plant on female fecundity and nymphal survival. Our study found that H. coagulata can successfully produce multiple generations when confined to a single host: grape (Vitis vinifera (L.)), citrus ( Citrus sinensis (L.) Osbeck.), or oleander (Nerium oleandrum L.). Our results indicate that H. coagulata do not require multiple hosts to survive in California, and that oviposition and development can occur successfully on citrus, grape and oleander.

ISBN: 9780542346545Subjects--Topical Terms:

1018619
Biology, Entomology.

Reproductive biology of the female Homalodisca coagulata (Say) (Hemiptera: Cicadellidae).
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100 1 $a Hummel, Natalie Anne. $3 1914773
245 1 0 $a Reproductive biology of the female Homalodisca coagulata (Say) (Hemiptera: Cicadellidae).
300 $a 136 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-10, Section: B, page: 5206.
500 $a Advisers: Frank G. Zalom; Christine Y. S. Peng.
502 $a Thesis (Ph.D.)--University of California, Davis, 2005.
520 $a The functional reproductive morphology of the female glassy-winged sharpshooter, Homalodisca coagulata (Say), is described at both light and scanning electron microscopy levels. The female has nine abdominal segments with the ninth modified as the pygofer. There are three pairs of valvulae and two pairs of valvifers. The pygofer, valvulae and valvifers bear many sensillae. The first and second valvulae function together for oviposition which is facilitated by seven major muscles. The oviposition process is described with respect to the activity of the valvulae and their associated musculature. The reproductive organs of H. coagulata consist of one pair of ovaries, paired lateral oviducts, a common oviduct, a spermatheca, an enlarged genital duct, a complex bursa copulatrix, a vagina, two types of accessory glands, and a genital chamber. To study the reproductive patterns, female H. coagulata were collected from October 2001 to February 2005 from citrus at the University of California, Riverside. Between five and twenty females per sampling date were dissected, and each was assigned an ovarian rank: previtellogenic, vitellogenic, or postvitellogenic. Based on the stage of oocyte development, a set of morphological criteria was selected to evaluate the rank of ovarian development for field-collected specimens. A principal component analysis found that the ovarian ranks were grouped according to reproductive status of the females. These dissections revealed that there are two distinct generations annually, with an occasional third generation. A step-wise regression model of H. coagulata vitellogenesis cycles in southern California was developed which predicts the appearance of subsequent generations based on oviposition activity. Finally, we examined the effect of host plant on female fecundity and nymphal survival. Our study found that H. coagulata can successfully produce multiple generations when confined to a single host: grape (Vitis vinifera (L.)), citrus ( Citrus sinensis (L.) Osbeck.), or oleander (Nerium oleandrum L.). Our results indicate that H. coagulata do not require multiple hosts to survive in California, and that oviposition and development can occur successfully on citrus, grape and oleander.
590 $a School code: 0029.
650 4 $a Biology, Entomology. $3 1018619
690 $a 0353
710 2 0 $a University of California, Davis. $3 1018682
773 0 $t Dissertation Abstracts International $g 66-10B.
790 1 0 $a Zalom, Frank G., $e advisor
790 1 0 $a Peng, Christine Y. S., $e advisor
790 $a 0029
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3191134