Slide Pack 4

Question 1

PD first identified in V. vinifera when and where?

Answer 1

1884 in southern California

Question 2

Pd first called?

Answer 2

Anaheim Disease

Question 3

Was PD attributed to the demise of grapevines brought over by European immigrants east of the Rocky Mountains? T or F

Answer 3

True

Question 4

How does PD kill grapevines?

Answer 4

By bacteria clogging their water conducting xylem vessels

Question 5

Does PD just infect grapes?

Answer 5

No, it can affect citrus, almonds, oleander and others

Question 6

What plant can have PD and be asymptomatic but act as a host that can spread PD?

Answer 6

Crape myrtle

Question 7

Since PD is native to Texas, Texas native grapevines are resistant? T or F

Answer 7

False, they have evolved tolerance to PD

Question 8

Pierce’s Disease scientific name?

Answer 8

Xyella Fastidiosa

Question 9

South and East Texas are severe for PD because of?

Answer 9

High humidity and precipitation that support insect vectors

Question 10

Northwestern Texas is generally asymptomatic for PD. Why?

Answer 10

Lower moisture and cold winter temperatures

Question 11

THC and DM are on the boundary of where PD is active. T or F

Answer 11

True

Question 12

PD is spread by what insect?

Answer 12

Glassy-winged sharpshooter (GWSS)

Question 13

PD tolerance appears to vary somewhat in certain varieties, but what varieties are susceptible?

Answer 13

All European grape varieties (V. vinifera) are susceptible

Question 14

How is PD controlled in today’s vineyards?

Answer 14

1) Vineyard management and pesticides
2) Planting FR-AM hybrids (BS & BdB)

Question 15

What is a new cross expected to be resistant to PD?

Answer 15

V. Vinfera x V. arizonica

Question 16

Can PD be controlled by planting location?

Answer 16

Yes, by planting distance away from riparian and shrubby areas (GWSS habitat)

Question 17

Can PD be controlled by removal of cover and host plants?

Answer 17

Yes, creates a buffer around vineyard

Question 18

Can sprayed insecticides control GWSS?

Answer 18

No, must use systemics

Question 19

How is Imidacloprid applied to help control GWSS?

Answer 19

Systemically in drip water

Question 20

Best way to control GWSS?

Answer 20

Plant PD resistant/tolerant varieties

Question 21

When was Black Spanish developed?

Answer 21

1680’s on US East Coast

Question 22

Black Spanish is an accidental cross between what varieties?

Answer 22

American native and French Cab Franc

Question 23

Blanc du Bois is a hybrid of what grapes?

Answer 23

Includes Muscat and Semillon

Question 24

Who developed BdB where and when?

Answer 24

John Mortensen in Florida, 1968

Question 25

BdB is the number grown and produced grape in Texas. T or F

Answer 25

True

Question 26

Walker PD resistant hybrid?

Answer 26

V. Vinifera x V. arizonica

Question 27

What researcher from UC Davis found a dominant single gene cluster PdR1 (chromosome 14) for PD resistance?

Answer 27

Andrew Walker

Question 28

V. arizonica has been planted and studied where?

Answer 28

American southwest (Texas, Arizona, New Mexico and Mexico)

Question 29

Multiple crossings of V. arizonica were insured to get what?

Answer 29

95-97% V. vinifera insuring good wine characteristics

Question 30

Is the V. arizonica a white or red grape?

Answer 30

Not sure. It has crosses from over 50% white grapes and has crosses from over 50% red grapes

Question 31

Has the Walker cross been planted in Texas?

Answer 31

Yes. In Carter Creek Winery near Johnson City and in vineyards near Sealy

Question 32

Where did Carter Creek purchase the Walker cross?

Answer 32

Wonderful Nurseries, Wasco, CA

Question 33

Walker Variety 1?

Answer 33

Camminare Noir

Question 34

Walker Hybrid 2?

Answer 34

Paseante Noir

Question 35

Walker Hybrid 3?

Answer 35

Errante Noir

Question 36

Walker Hybrid 4?

Answer 36

Ambulo Blanc