CAUTION: Use only DDT which has been prepared specifically for application 
on plants. Use it only on such plants as are recommended to it's use, including 
dahlias. Use it only at concentrations recommended. Use reasonable care in hand- 
ling it. 
DOWSPRAY-17 (Dinitro-o-cyclohexylphenol, Dicyclohexylamine salt) is another new 
insecticide which we used with excellent results to control red spider. This is a 
product of the Dow Chemical Co., Midland, Mich. and is one of several compounds 
commonly referred to as Di-Nitro, or DN, compounds. It was used with DDT here after 
a severe outbreak of red spider. Dr. Neiswander reports that it seems to be more 
effective in the presence of DDT than when used alone. It was far superior to any 
of the standard red spider sprays, most of which we had used in the past. It's im- 
portance as a dahlia spray lies in the fact that red spider becomes a much more 
serious pest (see page 40) when DDT is used. Dowspray-I7 is also recommended as 
an excellent control for thrip. It was used at the rate of. three quarters of a pound 
to 100 gallons of water. Very thorough application to all plant surfaces are necessary 
for optimum results. Cost is still relatively high, and, where cost is a factor, it may 
be well to wait until the red spider appears before using. 
DN-269 is another of the so-called DN compounds which has shown promise as 
a dust for red spider control. While better than previous red spider dusts, which 
were only slightly effective, DN-269, or other dust so far compounded, do not nearly 
equal the effectiveness of sprays. 
SABADILLA DUST, known as an insecticide for many years has been revived 
because of better compounding processes and it's use has resulted in effective control 
of leaf hoppers and tarnish plant beetles in a New York dahlia field. It may also 
control other insects. 
RYANEX used as a dust proved slightly better than a DDT dust for the control 
of the corn borer on corn here in Ohio. It may fit in with a dusting program for dahlias. 
"666" is a new English insecticide which will bear watching. It is reported to be 
more powerful and effective in the control of some insects than DDT. 

