DISEASES OF THE CUCUMBER : 
TECHNICAL DATA 
Page 2 
ANTHRACNOSE (CONT D) 
(d) 140% Calcium Arsenate; 30% Black Leaf 10, 414% Copper-A Compound; 46% Talc. 
- NOTE: as fruit maturity approaches, Black Leaf 40 probably will not 
be needed, therefore formulas (a) or (b) at this stage should prove 
satisfactory. 
BACTERIAL WILT: 
SYMPTOMS: One vine will wilt and shortly die. Within a few days, the entire 
lant will wilt with death following closely. To determine the disease, cut 
and expose a diseased runner: cross section, to air for a few minutes: press 
‘ends firmly together, separate and thin strands of Wilt Bacteria will string out. 
CAUSES: Spredd largely by the CUCUMBER BEETLE in which the organism over~ 
winters. The Cucurbit. species. are HOST. PLANTS (Watermelon excepted), 
CONTROLS: 
(14) ‘As the disease first appears, IMMEDIATELY remove all infected plants. 
(2) Wilt bacteria overwinter only in the CUCUMBER BEETLE: It is the most ser~ 
ious. factor in. the spread of the disease and its control can, very large~ 
ly solve the problem. DUSTING .is the best-control and ennumerated below. 
ate effective formulas. 
(a) 40% Calcium Arsenate, 90% Talc. 
(b) The same formulas and technique of application as outlined in the con-- 
‘trols for ANTHRACNOSE under headings (a); (b), (c), and (d) will be 
ote effective in the control of both the BEETLE and the WILT BAC— 
RIA. 
DAMPING OFF. 
SYMPTOMS: Plants fall over and die (at the ground line) of a wet- SoLt—Tror Jon 
the stems, Also, seeds rot in the ground. 
CAUSE: Various FUNGUS ORGANISIMS living in the soil. 
CONTROL: Dry powder treatment of the seeds before Brewul ads We have found 
ARASAN, SEMESAN, and SPERGON to be very effective. 
MACROSPORIUM LEAF BLIGHT. 
SYMPTOMS: Small, circular, slight water-soaked spots (which enlarge iG a eecele tek Gr= 
rections) appear on leaves. Diameter of the spots ranges from pin point to z 
inch or more and usually show concentric rings and a definite margin on upper: 
side of leaf..Infection occurs first near center of vine but soon spreads to 
all leaves and, in severe cases, will defolicate the vine. 

CAUSES: A FUNGUS ORGANISM carried by irrigation water and wind. Over-winters 
‘in diseased HOST PLANT decayed matter and will live in the soil at least a 
full year, 
+ 
CONTROLS: 
(4) DUSTS. (If Macrosporium Leaf Blight is the only disease or pest.) 
(a) 6% Yellow Cuprocide; 94% Talc. 
(b) 144% Copper-A Compound; 86% Talc. 
NOTE: If Cucumber Beetles, Bacterial Blight, Anthracnose, or Angular 
Leaf Spot.are also present, Dust Formulas given for Anthracnose, (for- 
mulas (a),.(b), (c), are also effective for Mdacrosporium Leaf Blight. 
(2) SPRAYS (If Macrosporium Blight is the only disease or pest.) 
(a) Per 100 gal. of water; 47 1b. Yellow Cuprocide, 2° OZ. i ninton *(B41956) 
spreader (solt water) and 4 oz.(hard water). 
(b) Per 100 gal. of water, 4 1b. Copper-A Compound; z oz. Trinton (B~1956) 
spreader (soft water) and 2 oz. (hard water). 
fel uber 400 dal, sof water) 2 qt. Dithane: @: ib. Zinc Sulphate; .7. 1b," Hy- 
drated ‘bime... oz. Trinton (B-1956) spreader (soft water) and 1 oz. 
(hard water). 
MOSAIC (also known as NUBBIN DISEASE, WHITE PICKLE and WHITE WART. ) 
SYMPTOMS: Edge of leaves turn downward, whole leaf becomes wrinkled and mottled 
with yellow and green blotches. Green, warted projections with light areas 
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