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DISEASE UPDATE 04 Paul E. Bertrand. SPOTTED WILT. TILLAGE TRANSPLANTS ADMIRE ACTIGARD. TILLAGE. FIELD WEEDS. WHEAT (GRASSES) AS A TSWV SOURCE. WHEAT (GRASSES) AS A TSWV SOURCE. 1 . MOST THRIPS LEAVING WHEAT ARE CEREAL THRIPS WHICH DO NOT TRANSMIT TSWV .

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spotted wilt
SPOTTED WILT
  • TILLAGE
  • TRANSPLANTS
  • ADMIRE
  • ACTIGARD
tillage
TILLAGE

FIELD WEEDS

wheat grasses as a tswv source5
WHEAT (GRASSES)AS A TSWV SOURCE

1.MOST THRIPS LEAVING WHEAT

ARE CEREAL THRIPS WHICH

DO NOT TRANSMIT TSWV.

wheat grasses as a tswv source6
WHEAT (GRASSES)AS A TSWV SOURCE

1.MOST THRIPS LEAVING WHEAT

ARE CEREAL THRIPS WHICH

DO NOT TRANSMIT TSWV.

2.WHEAT IS NOT A TSWV HOST.

slide7
TSWV

ACQUIRED FOR

TRANSMISSION

ONLY BY JUVENILES

and ---

slide8
TSWV

NECESSARY JUVENILE

STAGE EXISTS ONLY

12 - 15 HRS.

so ---

slide9
TSWV

TO TRANSMIT TSWV LATER THRIPS MUST HATCH ON OR NEAR INFECTED PLANTS

wheat grasses as a tswv source10
WHEAT (GRASSES)AS A TSWV SOURCE

1.MOST THRIPS LEAVING WHEAT

ARE CEREAL THRIPS WHICH

DO NOT TRANSMIT TSWV.

2. WHEAT IS NOT A TSWV HOST.

3.TOBACCO THRIPS HATCHED ON

WHEAT HAVE NO OPPORTUNITY

TO ACQUIRE TSWV.

slide11

IN FIELD WEED

MANAGEMENT

in field weed management
IN FIELD WEEDMANAGEMENT
  • CLEAN ROWS
  • WEEDY ROWS
  • WHEAT ROWS
in field weed management14
IN FIELD WEEDMANAGEMENT
  • 2 ROW
  • 4 ROW
  • 8 ROW

TOBACCO

slide16

2004

EARLY WEEDS

SUMNER: 42/90 ELISA+

GRINER: 58/90 ELISA+

slide20

WHEAT

SUMNER: 0/90 ELISA+

GRINER: 0/90 ELISA+

slide21

REDISTRIBUTION OF

ADULT THRIPS FROM WHEAT ?

sumner farm
SUMNER FARM

% TSWV

ROW FROM COVER

griner farm
GRINER FARM

% TSWV

ROW FROM COVER

wheat grasses as a tswv source25
WHEAT (GRASSES)AS A TSWV SOURCE

1.NOT A SOURCE

but

2.CAN PLAY A ROLE

tillage26
TILLAGE

STRIP TILL

results
RESULTS

% TSWV

but---

slide29

2004

LITTER LEFT STANDING

slide31

LAY BY

LITTER CUT OUT

5 WEEKS POST TP

slide34

ARE THE PLANTS

THEMSELVES

DIFFERENT ?

house vs bed plants
HOUSE vs BED PLANTS
  • 9 SOURCES OF PLANTS
  • COLLECTED THE SAME DAY
  • GROWN AT 2 LOCATIONS
  • SET THE SAME DAY
  • ADMIRE 2.0 oz /1,000 (TPW)
infected transplants
HOUSE

0 - 1 %

INFECTED TRANSPLANTS

2/5 LOTS HAD ONE ELISA+ PLANT

infected transplants38
HOUSE

0 - 1 %

BED

0 %

INFECTED TRANSPLANTS

2/5 LOTS HAD ONE ELISA+ PLANT

expected results
EXPECTED RESULTS
  • BETTER RESPONSE TO TPW ADMIRE WITH HOUSE PLANTS
  • SOME STAND LOSS WITH BED PLANTS & TPW ADMIRE
unexpected results
UNEXPECTED RESULTS
  • MORE INFECTED HOUSE PLANTS
  • MORE TSWV WITH HOUSE PLANTS
2004 results similar to 2003
2004 RESULTSSIMILAR TO 2003
  • MORE TSWV WITH HOUSE PLANTS
  • BETTER RESPONSE TO TPW ADMIRE WITH HOUSE PLANTS
  • SOME STAND LOSS WITH BED PLANTS & TPW ADMIRE
infected transplants52
INFECTED TRANSPLANTS

HOUSE

1 - 4

BED

0 - 6

96

96

2004 results53
2004 RESULTS
  • SIMILAR TSWV INFECTION IN BED AND HOUSE PLANTS
  • NO CORRELATION BETWEEN ELISA+ TRANSPLANTS AND:
      • STAND LOSS
      • EARLY TSWV
      • FINAL TSWV
slide55

FLOAT HOUSES

~ 65 % OF PLANTS

ADMIRE DRENCH TRT.

~ 90 % SUCCESS

slide56

PLANT BEDS

~ 30 % OF PLANTS

ADMIRE TPW TRT.

~ 55 % SUCCESS

admire57
ADMIRE

BOTH METHODS

CONTROL

LATER APHIDS

slide60

T-RAIL HOUSES

~ 5 % OF PLANTS

ADMIRE DRENCH TRT.

~ 35 % SUCCESS

t rail houses
T-RAIL HOUSES

IS IRRIGATION

WASHING ADMIRE

OUT OF TRAYS ?

2004 trials 6
2004 TRIALS (6)

NOT MUCH

TREATMENT

DIFFERENCE

actigard
ACTIGARD:

TRANSPLANT

TREATMENT

actigard treatment house plants
ACTIGARD TREATMENT(HOUSE PLANTS)
  • 1.0 oz. / 100,000 PLANTS
  • SPRAY ON
  • 7 - 14 DAYS PRE TP
  • SET IN PRE WETTED BEDS
actigard66
ACTIGARD:

FIELD SPRAYS

2002 results
2002 RESULTS

FINAL % TSWV

2004 results71
2004 RESULTS

FINAL % TSWV

actigard field sprays
ACTIGARDFIELD SPRAYS
  • NOT CONSISTANT (FARM TO FARM)
  • 1 SPRAY INCREASED TSWV
  • 5 SPRAYS WORK BEST:
      • 0,7,14,21,28 DAYS POST T P
      • $125 / Ac
  • LAST 2 SPRAYS (21&28 DAYS) ?
slide73

BLACK

SHANK

black shank
BLACK SHANK

RACE 1SITUATION

slide75

BLACK SHANK

RACE 1 DISASTER

all high resistance varieties have this gene
ALL HIGH RESISTANCE VARIETIES HAVETHIS GENE

NC-71 Sp G168

NC-72 Sp GH20

NC-297

etc.

black shank race 1
BLACK SHANKRACE 1
  • MAINTAIN OR INCREASE ROTATION TIME

and ---

  • ALTERNATE HIGH RES. WITH K-346
black shank race 180
BLACK SHANKRACE 1
  • MAINTAIN OR INCREASE ROTATION TIME

and ---

  • ALTERNATE HIGH RES. WITH K-346

and ---

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