Fruit Pest News

October 2, 2001

A weekly, online newsletter whose goal is to update Extension agents and growers of commercial tree fruit and small fruit crops on diseases and insects in Tennessee.

This is the last issue of Fruit Pest News for 2001. The next issue should be posted at this web site around March 1, 2002.

This issue of Fruit Pest News includes a subject index for all issues to date for this year.  This index will allow you to review a topic, and there should be new readers (hopefully) who might wish to read certain topics that they missed. The opening page of the Fruit Pest News web site contains a list of all of the issues. You can connect to the issue of interest there.

We want to take this opportunity to thank you for your readership. Please help us spread the word to other interested readers. This newsletter is for you, so please let us know how we can improve it to serve you better. Suggestions for topics to address are very welcome. The greatest need I see is for more scouting reports from across the state. We're grateful for the insect trap counts that some of you have been sending us. We would like to hear when you see a disease or insect for the first time for the year, or if you are experiencing a severe outbreak. The weekly format of this newsletter is designed for reporting such time-sensitive news. Try to phone or e-mail us your news. Of course, all reports are kept anonymous (unless you want us to use your name!). (SB)

In This Issue:

 

    1. Grapes: Watch for Pierce's Disease

    2. Index for 2001

GRAPES: WATCH FOR PIERCE'S DISEASE

Pierce's Disease has been found in grapes in Kentucky. This is a potentially devastating disease that has impacted the distribution of grape-growing regions in the southeastern U.S. and California. It is not known whether the source of the Kentucky case was infected nursery stock or the field environment. Pierce's Disease is caused by a bacterium that is transmitted by leafhoppers.

Symptoms include a scorching of the leaves that begins near the margin of the leaf blade. As summer progresses into fall, scorching spreads inward until the entire leaf blade is affected. Leaves often fall from the vine at the point of attachment to the petiole, leaving the petiole still attached to the shoot. Most vinifera varieties die within two to five years while labrusca varieties often live longer than five years.

This disease has been suspected in Tennessee, but never confirmed, to my knowledge. It would be prudent to confirm suspected cases, so that attempts to identify the sources could be made. The U.T. Plant and Pest Diagnostic Center has the capability of conducting the Pierce's Disease test. Please contact your county Extension agent for assistance in submitting suspected samples to the lab. (SB)

 Fruit Pest News Index, 3/13/01 through 10/2/01

Crop

Subject

Issue Date

Apple

Alternaria leaf blotch, description and control

6/18

 

bitter rot, description and control

7/9

 

blister spot, early-season control

3/26

 

disease alert

5/29

 

diseases, early-season

3/26, 4/2

 

diseases, summer, control program

6/11

 

dogwood borer, description and control

5/29

 

fire blight, alert

4/9

 

fire blight, early-season control

3/26

 

fire blight, first report of year

4/23

 

fire blight, MaryBlyt, description and update

3/13, 4/9, 4/16, 4/23, 5/7, 5/21

 

fire blight, shoot blight and canker blight, description and control

5/7

 

fire blight, shoot blight, first report of year

5/21

 

fire blight, secondary blooms, importance of

5/7

 

fire blight, summertime control strategies

6/11

 

fire blight, trauma blight

6/4

 

fungicide spray program, bloom and petal fall

4/16

 

Glomerella leaf blotch, description and control

6/18

 

insects, degree-days, calculating

4/30

 

insects, evaluating control at harvest

9/17

 

insects, late-season

8/20, 9/4, 9/17

 

insects, new control recommendations

4/2

 

insects, pheromone traps, how to use

3/13, 4/16, 4/23, 4/30, 5/7

 

insects, pheromone traps, count updates

4/2, 4/16, 4/23, 4/30, 5/7, 5/29, 6/11, 6/26, 7/9

 

mites, European red and twospotted

6/26

 

necrotic leaf blotch of Golden Delicious, description and control

6/4, 6/18

 

obliquebanded leafroller, description

5/29

 

Phytophthora crown rot and collar rot

8/6

 

plant bugs, description

6/11

 

postharvest treatments

8/20

 

potato leafhopper, description and control

6/26

 

redbanded leafroller, description

5/29

 

redbanded leafroller moth activity

3/26

 

scab, early-season control

3/26

 

scab, secondary, control

5/29, 6/11

 

sooty blotch, first appearance

6/18

 

sooty blotch and flyspeck, control

7/23

 

Southern Appalachian IPM Project

3/19

 

storage diseases, description and control

9/4

 

storage decays, control

9/4

 

summer diseases, control

8/6

 

white apple leafhopper, description and control

6/26

Blackberry and Raspberry

anthracnose, description and control

6/25

 

Botrytis (gray mold), description and control

6/25

 

cane blight, description and control

8/6

 

double blossom - see "rosette"

 

 

orange rust, description and control

4/30

 

rosette, description and control

4/16, 6/18

 

Switch fungicide, registration status

3/19

 

Septoria leaf spot of raspberry, description and control

6/25

Blueberry

stem blight, description and control

7/23

 

twig blight, description and control

5/14

Grape

black rot, fungicides for

4/9, 5/29

 

black rot, spray program strategies

5/21

 

bitter rot, description and control

7/23

 

Botrytis bunch rot, time for spray

5/21, 7/9

 

downy mildew, description and control

6/25

 

fungicide spray program, early-season

4/9

 

Phomopsis cane and leaf spot, fungicides for

4/9, 5/29

 

Pierce's Disease alert

10/2

 

powdery mildew, fungicides for

4/9, 5/29

Peach and other stone fruits

bacterial spot, description and control

5/14

 

black knot (plum and cherry), control

8/6

 

brown rot, description and control

6/18, 7/9

 

green fruit rot, description and control

5/14

 

insects, pheromone traps, how to use

3/13, 4/16, 4/23, 4/30, 5/7

 

insects, degree-days, calculating

4/30

 

plant bugs, description

6/11

 

plum pox, survey plans and budwood testing program

5/7

 

plum pox update

7/23, 9/17

 

scab, description and control

5/14, 5/29

Strawberry

anthracnose, scouting and control

3/19, 4/9

 

anthracnose, reports

4/30, 5/21

 

Botrytis - see "gray mold"

 

 

diseases, first reports of year

4/30

 

disease control after harvest, matted row

6/4

 

disease control in fall

9/17

 

fungicides, current status and spray strategy

3/13, 3/26

 

gray mold, sanitation and cultural practices for control

3/13

 

leaf spot, common, fungicides for

5/29

 

Phytophthora diseases, control

3/26

 

Phytophthora crown rot, scouting and control

3/19, 6/4

 

Quadris, Section 18 label approved

3/26

 

Switch fungicide, registration status

3/19

 

Switch fungicide receives registration

9/4

Miscellaneous

assistance with pest identification, Distance Diagnostics

6/18

 

current conditions and crop development stages

3/13, 3/26, 4/2, 4/9, 4/16, 4/30, 5/7, 5/21, 5/29

 

Benomyl (Benlate) fungicide to be discontinued

4/23

 

Benomyl, effects of loss on fruit production

5/14

 

disease alert, cool weather

5/29

 

crown gall, new control

4/30

 

freeze, crop damage from

5/21

 

Fruit Pest News, description

3/13

 

methyl bromide, status and replacement options

3/26

 

pumpkin fruit rots, control

9/17

 

Ronilan, dealing with processed fruit treated with

8/6

 

small fruit, changes in disease-control recommendations for 2001

4/2

 

spray guide (backyard), revisions and how to obtain

3/19

 

spray guides (commercial), how to obtain

3/19

The Fruit Pest News URL is: http://web.utk.edu/~extepp/fpn/fpn.htm

Contacts:

 

Steve Bost, Professor and Extension Plant Pathologist

scbost@utk.edu

 

Frank Hale, Associate Professor and Extension Entomologist

fahale@ext1.ag.utk.edu

 

Both authors available at:

615-832-6802

fax 615-781-2568

Plant and Pest Diagnostic Center

5201 Marchant Drive

Nashville, TN 37211