PEST and DISEASE CONTROL CHART 
INSECT 
Red spider 
Leaf roller 
Mum midge 
White fly 
Leafhopper 
Scale 
Tarnished 
plant bug 
CONTROL MEASURE 
REMARKS 
/ 
DISEASE 
CONTROL MEASURE 
REMARKS 
Parathion bomb, spray, or 
dust. 
in the presence 
of sulfur causes leafdrop 
on roses. Parathion bombs 
not recommended on chry- 
santhemum flowers. 
Parathion 
TEPP bomb or spray. Di- 
thion bomb or smoke gen- 
erator. 
Avoid wetting soil with 
spray. 
Ovotran (K-6451) bomb or 
spray. 
The 50% wettable powder 
can be painted on steam 
Pipes using 1 Ib. per 100,- 
000 cu. ft. Vents should 
be closed 6-8 hours, tem- 
perature range 60°-85° F. 
Sodium selenate on toler- 
ant crops. 
Carnations, 
snapdragons, 
and St. Paulia. 
mums, asters, 
cyclamen, 
Aramite spray or bomb. 
Use 11% Ibs. of the 15% 
wettable powder per 100 
gal. plus a spreader and 
thoroughly cover the plant. 
Non-poisonous to humans, 
and has a long residual 
action on the plant. 
Dimite spray. 
Use at 1-1200 or 1-1600; 
stronger dilutions usually 
cause injury. 
Rotenone sprays. 
Less effective than any of 
the above and the oil in 
which it is dissolved may 
cause damage to some 
plants. 
Any, 
inside or 
outside 
Parathion, Lindane, BHC, 
DDT. 
Gladiolus 
bulbs 
5% DDT dust. 
Corrosive sublimate, Lysol, 
formaldehyde. 
Parathion and DDT injure 
Kalanchoe and some other 
succulents. 
1 to 3 oz. per bushel of 
bulbs. 
Any 
Parathion bomb, spray, or 
dust. 
Dithion bomb or 
generator. 
TEPP bomb or spray. 
Lindane or BHC spray or 
dust. 
Nicotine and soap spray or 
nicotine fumigation. 
Rotenone spray or dust. 
smoke 
Bulb disinfectants. 
DDT or Parathion. 
Dithion bomb or smoke, 
generator for soft brown 
scale. Three times at 3 to 
5-day __intervals—effective 
only on crawlers. 
Mealybugs 
Parathion bomb or spray. 
Dithion spray or smoke 
generator. 
TEPP sprays. 
Repeated applications nec- 
essary. Parathion not rec- 
ommended on_ poinsettias 
after they show color. 
Use Santomerse S 1-2000 
as a spreader for better 
effectiveness. 
Damping-off 
Stem rot 
Arasan. 
Treat seeds — light cover- 
ing only. 
Fermate, Zerlate, or Par- 
zate. 
Destroy diseased seedlings 
or cuttings and dust light- 
ly to prevent spread. 
Steam sterilize soil mix- 
ture and pots. 
Avoid injury to stems of 
seedlings or cuttings when 
potting or planting. 
Black spot 
Chrysanthemum 
English Ivy 
1lb. Fermate per 100 gal. 
with Santomerse S 1-2000. 
Avoid splashing water on 
foliage. Regular spraying 
necessary. 
Mildew 
Calendula 
Chrysanthemum 
Hydrangea 
Rose 
Saintpaulia 
1 Ib. Fermate, Zerlate, or 
Parzate per 100 gal. with 
Santomerse S 1-2000. 
Avoid splashing water on 
foliage. Cover lower sur- 
face of mum foliage. 
6-8 oz. Iscothan per 100 
gal. with Santomerse S$ 1- 
2000. 
Apply when plants will dry 
rapidly. May cause yellow 
spotting on some rose 
varieties. 
Wettable sulfur sprays 
with Santomerse S 1-2000. 
Sulfur dust. 
Often bleaches flowers. 
Parathion and sulfur to- 
gether cause leafdrop on 
roses. 
Greenol, Fungtrogen, 
Grape and Rose dust. 
Root rot 
and 
Soft rot 
2 oz. wettable Spergon in 
1 gal. water. Soak 3 
hours. 
Cut off all rotted portions 
of bulb before soaking. 
Steam sterilize soil and 
pots. Plant bulbs imme- 
diately after soaking treat- 
ment. 
1 Ib. New Improved Cer- 
esan per 50 gal. water. 
Soak 1 hour. 
Use non-metallic container. 
Formaldehyde 1-50. Soak 
1 hour. 
Leafspots 
and 
foliage 
blights 
(bacterial 
and fungus) 
Aster 
Azalea 
Begonia 
Carnation 
Chrysanthemum 
Cyclamen 
English Ivy 
Gardenia 
Geranium 
Hydrangea 
Fermate, Zerlate, or Par- 
zate sprays or dusts. Avoid 
splashing water on  foli- 
age. Give plenty of space 
and air. 
Discard badly infected 
plants. On English ivy it 
is reported that a soil re- 
action near pH 5.0 reduces 
leafspot. 
Botrytis 
blight 
Carnation 
Chrysanthemum 
Snapdragon 
High humidity favors its 
development. Use some 
heat and ventilation even 
in mild weather. 
Called petal blight and is 
quite common on white or 
soft varieties of carnations 
and chrysanthemus. 
Fermate, Zerlate, Parzate 
sprays. 
May cause undesirable 
spotting of petals. 
Ants 
Grasshoppers 
Chlordane dust or spray. 
Slugs 
Snails 
Cutworms 
Sowbugs 
Snarol. 
Snailicide. 
DDT dust for sowbugs. 
Leafminer 
and Foliar 
nematode 
Chrysanthemum 
Parathion spray. 
Repeated applications nec- 
essary. 
Sodium selenate. 
Nicotine 1-200 & soap. 
Usually burns the foliage. 
Rose midge 
and 
Strawberry 
root worm 
DDT. Three sprays of wet- 
table powder on plants, 
soil, and walks 10 days 
apart. 
Pinch and destroy heavily 
infested shoots. 
Parathion bomb, 
Only effective when pests 
are feeding on the foliage. 
When the pest is in the 
soil for part of its life 
cycle, bomb is not effec- 
tive. 
Begonia 
Cyclamen 
English lvy 
Saintpaulia 
Snapdragon 
Parathion spray. 
Repeated applications nec- 
essary. Usually injures cy- 
clamen severely. 
Dimite spray. 
Rotenone & nicotine spray. 
Root aphids 
Fern 
Palm 
Poinsettia 
Lindane—use 1 oz. of 
wettable powder per 30 
gal. and apply as a liquid 
fertilizer. 
Repeated applications nec- 
essary—as often as every 
5-7 days. 
Symphylids 
Any 
Lindane—see Root aphids. 
Root 
nematode 
Aster 
Carnation 
Chrysanthemum 
Snapdragon 
Fermate, Zerlate, or Par- 
zate sprays with Santo- 
merse S 1-2000. Wettable 
sulfur with Santomerse 
S 1-2000. Sulfur dust. 
Avoid splashing water on 
foliage. 
Any 
Steam sterilize soil, pots. 
Pot plant benches should 
be steamed to prevent re- 
infestation. 
Dow MC-2. 
Fumes toxic to humans. 
Chrysanthemum 
Discard stock, including 
diseased and ‘‘apparently 
healthy'’ plants. Buy stunt- 
free plants. 
A virus which is slow to 
show symptoms. Appar- 
ently healthy plants may 
have stunt in them. 
Chlorosis 
Azalea 
Gardenia 
Hydrangea 
Re-establish root action by 
carrying on the dry side 
and apply iron sulfate at 
1 oz. per 2 gal. 
Acid peat desirable in soil 
mixture. 
May be caused by high 
pH, overwatering, root 
nematodes, symphylids. 
Chrysanthemum 
Snapdragon 
Often caused by high ni- 
trates. Leach or apply a 
mulch of chopped straw or 
ground corncobs. 
If due to high soluble 
salts, leach thoroughly. 
Soil 
preventing 
testing is useful in 
this. 
Destroy badly infected 
plants. 
Often spread by aphids. 
Keep them under control. 
a a es 
Compiled by 
OHIO FLORISTS ASSOCIATION 
