pala te 

DISEASE 
FOLIAR 
NEMATODE 
(See Picture 
on Page 17) 
MILDEW 
(See Picture 
on Page 17) 
ROOT KNOT 
NEMATODE 
(Eelworm) 
RUST 
(See Picture 
on Page 5) 
SEPTORIA 
LEAF SPOT 
Leaf Blight) 
See Picture 
on Page 3) 
VERTICILLIUM 
WILT 
(Seidewitz Disease) 
(See Picture 
on Page 5) 
SYMPTOMS 
Leaves first turn black or chocolate 
brown and leathery, then shrivel 
up, become brittle. Begins at base 
of stem and may work up to the 
flowers. 
Whitish powdery growth on upper 
surface of leaves. 
The nematodes or eelworms bore 
into the roots of the plants and 
cause knots or galls to develop on 
the root systems. As a result the 
plants are weak, yellowish and 
stunted in growth. 
Entire plant will wilt and recover 
during the evening. Foliage turns 
yellow, entire plant will die in a 
very short time. A number of soil 
born organisms cause the loss of 
the roots. 
Chocolate brown powdery pustules 
on the lower surface of the leaves. 
Distinct circular spots on the leaves. 
These are greyish brown in color 
and become brittle in the center. 
Affected leaves may turn yellow and 
die. More prevalent out of doors. 
Some varieties are more suscepti- 
ble than others. Sea Gull is very 
susceptible. 
Margins of leaves turn yellow and 
eventually wilt or dry up. This be- 
gins at base of plant and works up 
the stems. May affect one side of 
a stem or plant more than the other. 
No distinct spots. Varieties vary in 
resistance to this disease. 

CONTROL 
Strip off all the leaves from the lower 
6 to 8 inches of all plants as soon as 
possible. Spray with double strength 
nicofume plus Bordeaux Mixture. 
Spray at regular weekly intervals with 
a good wettable sulfur, | lb. per 100 
gallons of water to which a good com- 
mercial spreader has been added. 
Dusting with a good dusting sulfur 
will give equally good results, 
Soil sterilization, preferably with steam, 
is very effective in eliminating the 
root knot nematodes from the soil. 
Do not plant any cuttings that have 
been infected with damping off. Use 
sterilized soil. Remove all affected 
plants when noticed. 
Same as for Mildew. 
Spray with 2-2-50 Bordeaux Mixture 
ie a good commercial spreader 
about 3 or 4 days after planting and 
continue at regular weekly intervals 
until about the middle of July. 
Fermate, | lb. per 100 gals. with Du- 
Pont Spreader-Sticker at !-3000, has 
given remarkable control, being equal, 
if not superior, to Bordeaux Mixture. 
Plant only disease free cultured cut- 
tings in soil which has been steam 
sterilized. 
We have omitted recommending insecticides containing pyrethrum and rotenone which are prohibited by governmental 
regulations on all flower crops. 

