22 
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Diseases and Insects 
BLACK-SPOT. There are two main general diseases to which the Rose is subject; viz., 
Black-Spot and Mildew. The former, as its name indicates, appears as a black or brownish 
spot on the foliage. It rarely puts in an appearance until about the close of the first blooming 
season in June. It always appears first on the lowest foliage and works upward. As a result, 
this disease will often practically defoliate the bush. It will not kill the latter but will check 
the growth and bloom for the season and so weaken the plant that it may die back over winter. 
MILDEW. This is shown in a grayish, crinkled appearance of the foliage. Like black-spot, 
it is of a fungous nature, the spores fastening themselves on the bottom of the leaf and spreading 
rapidly unless checked. It is most likely to occur where the air-circulation is defective or 
confined and particularly after cold nights following warm days. 
Treatment of Both. The two diseases may be prevented by the use of the Massey Dust, a 
preparation consisting of nine parts of a very finely prepared sulphur (not flowers of sulphur) 
and one part lead arsenate. This is now manufactured with the addition of a green coloring 
matter to make it inconspicuous on the foliage, to increase its fungicidal value and is sold as 
Porno-Green, with or without nicotine. With the nicotine sulphate added, it is a complete 
fungicide and insecticide combined. We have used Pomo-Green on our extensive Rose-plantings 
for the past eight years. During this time we have also experimented with many other com¬ 
mercial fungicides, but none have prevented black-spot and mildew so easily as Pomo-Green 
used as a dust. We therefore recommend it highly and are pleased to offer it as a direct service 
to our Rose patrons. 
~ ~ 1 — 
Dust Gun 
5 lbs. Pomo-Green with Nicotine. For Black-Spot, Mildew, Leaf-eating 
Insects, and Aphis . .$3 00 
1 Improved Dust Gun. 1 50 
$4 50 
Special Offer of combination for.$3 90 
5 lbs. Pomo-Green without Nicotine. For Black-Spot, Mildew, and Leaf¬ 
eating Insects. (Used where Aphis are not always a garden problem) $1 75 
1 Improved Dust Gun . . 1 50 
$3 25 
Special Offer of combination for..$2 85 
Five pounds of either material is sufficient for keeping 50 Hybrid Tea Roses in good health 
throughout the active growing season. 
Sent Express Collect. 
Pomo-Green is not for Roses alone, but for the entire garden. 
Another very good commercial fungicide and insecticide is Tri-ogen. This must be used as 
a spray and prevents black-spot and mildew. Prices on request. 
When to Apply Dust or Spray. Best applied in early morning or late in the evening when 
the air is quiet. Since prevention rather than cure must be the spirit of complete control of 
black-spot, it is essential that you start dusting or spraying as soon as the plants are in active 
growth, when the leaves are fully open and the new shoots are taking on height. Apply ap¬ 
proximately every ten days, but less frequently during prolonged hot, dry spells in midsummer. 
Thoroughness of application is far more important than the quantity of material used. 
The under side of the foliage must be reached because it is there that the tiny spores of 
black-spot, just like tiny seeds, begin to germinate in the presence of moisture. Hence the 
paramount importance of seeing that Rose foliage is covered with an active fungicide during 
rainy periods. 
SLUGS AND WORMS. These chewing pests are killed with the lead arsenate contact of 
most all commercial mixtures. 
APHIS OR GREEN FLY. Various colored aphis suck the juice from the leaves and must 
be killed by smothering their bodies with a contact spray such as Black-Leaf 40, Red Arrow, 
or Ever Green spray. While they can easily be seen, still they are not nearly so injurious as 
the invisible spores ol black-spot. 
Red spider, leaf hoppers, thrips, and other almost microscopic insects are also killed by 
contact sprays, or by the fine dusting sulphur in the Pomo-Green mixture. 
ROSE BUGS AND CHAFER. A very familiar pest whose appearance is, fortunately, 
limited to about two or three weeks in June. Troublesome in some localities, but never present 
in others. A very stupid insect that feeds on the petals of white and light-colored Roses and 
must be picked off the bloom and drowned in kerosene. There is no other remedy. 
