ven118lecc11_(granett_phylloxera_08)

ven118lecc11_(granett_phylloxera_08) - 1 J. Granett...

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Unformatted text preview: 1 J. Granett Emeritus, Entomology Dept G r a p e P h y l l o x e r a VEN 118, 6 Nov 08 jgranett@ucdavis.edu Daktulosphaira vitifoliae Fitch Phylloxeridae, Hemiptera 2 1. Distr ibution 2. Biology 3. Damage 4. Contr ol (Pr evention) 1. Futur e 2. Take-home messages Dist 3 N ative distr ibution (Hosts, phylloxera) World dist V . g i r d i a n a V. ber landier i V. r upest r is Data from Winkler et al. 1974 V. r ipar ia V . a r i z o n i c a V. calif or nica V. champinii V. aest ivalis & volpina V . g i r d i a n a V. ber landier i V. r upest r is Data from Winkler et al. 1974 V. r ipar ia V . a r i z o n i c a V. calif or nica V. champinii V. aest ivalis & volpina 4 V. vinifera V. vinifera New host V. vulpina V. aestivalis US Southeast V. riparia US Northeast Original host Phylloxera origin ? Downie 2002 Molecular Ecology 11 , 20132026 Primary, Tertiary roots 5 2. Biology N odosities on Pr imar y r oots Ter tiar y r oots Tuber osities 6 7 C a l i f o r n i a ( M in im a lly ) ` Nymphs with wing pads Sexual generation Alate generation In leaf galls Instar 1 nymph, (crawler) Instar 2 nymph Instar 3 nymph Instar 4 nymph Adult female male Adult alate Adults Instar 4 nymphs Instar 3 nymphs Instar 2 nymphs Instar 1 nymphs Eggs Asexual generations On roots Egg (on Vitis arizonica ) Demog 8 l adult = living to adult stage (survival) T = generation (days: egg egg) (developmental rate) GRR = gross reproductive rate = eggs/ /day Phylloxer a demogr aphy Demog 9 Demogr aphy Fecundity egg adult 60 days Survival 4 2 1.0 0.5 nymph AXR#1 V. vinifer a St. Geor ge Biotic eggs/ /day proportion surviving days to first egg 10 Populations Biotic factor s Susceptibility factors Root abundance (primary to tertiary roots) Insect recognition of plant Gall formation by plant Root resistance Antibiosis: Non recognition or response, direct toxic mortality, hypersensitivity, nutrition non-preference; tolerance Mortality factors Root mortality (pathogens, physiology) Population increase factors Root growth (cultivar, management) Fungal necrosis of fed-upon roots B i o t y p e s P h e n o t y p e s S t r a i n s Attached 11 Phloem parenchyma N utr ient s Sur viva l Develop- ment, Repr o- Gall for matio n Recog- Susceptibility nition or not, toxins, hyper sensitivity H m m m , t h i s i s r a t e- l i m i t i n g !...
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This note was uploaded on 09/29/2010 for the course VEN 81437 taught by Professor Larrywilliams during the Fall '10 term at UC Davis.

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ven118lecc11_(granett_phylloxera_08) - 1 J. Granett...

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