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ecticide is available under trade names of Vapotone, Hexcide, Blot, Kill-Ex and Arbortox 
ry likely many more will be added within the year. HETP as it is commonly referred to-in the 
sed as a spray or in aerosol dispensers. This new insecticide is extremely effective in killing 
ive stages aan spider, but little kill.on the eggs. This material also gave good control for 
f tyers, aphids and mealy bugs. Follow the directions of the manufacturer and remember this - 
ills on contact only so you will have to do a thorough spraying to get good results. 
* decompose very rapidly after it is mixed with water, therefore is necessary to use the mixed 
spray very soon after mixing and never hold over any left over spray mixture. Precaution is to spray 
_ HETP in the morning so the plants will dry off rapidly. In cloudy weather or when the humidity is ex- 
ceptionally high the foliage will stay moist for three to four hours after spraying a spotting of the 
__ leaves will appear on chrysanthemums. 
+ Aerosol bombs are being carefully tried by the U.S.D.A. and excellent control of red spider may be 
expected by making four applications at three-day intervals. Allow the houses to stay closed for about. 
i ‘; I'¥2 hours atter the application. The range of temperature is from 60-90 degrees. 
i] cee Sodium Selenate 
| ~~ This material has been on the market for the past several years but is comparably new to a large num- 
| ~—___ ber of growers. This material is applied to the soil and is absorbed by the plant through the roots will 
___ kill foliar nematodes, red spider, mites, midge and aphids. Available as P-40 or as a powder, applica- 
i. eae tions every 3 months are necessary as it leaches from the soil. 
| P-40 is applied dry at the rate of 3 pounds per 100 square feet of area. Sodium selenate crystals are 
. applied in liquid orm and a stock solution is made by dissolving | pound in 4'/2 gallons of water. 
For most crops the suggested dosage is '/4 gram sodium selenate per square foot (equal to | pound to 
1800 square feet.) Each quart of stock solution contains 25 grams and is therefore enough for 100 
| t of bench surface. It must be diluted with additional water to get even application and 
good ribution in the soil. Full directions are available with the material. 
On chrysanthemums we recommend '/4 gram sodium selenate per square foot. The safest method is to 
mi ce two applications at the ’ gram rate a week or so apart. 
the precautions and syringe off any solution which might get on the foliage. Do not treat plants 
r more weeks after transplanting. Be sure to apply the correct amount evenly. Sodium selenate 
; pats treat it as such. 
A; obenzene Pale | . | 
Be aem Blauvelt did the earlier research work with this material in controlling red spiders. This ma- 
rial i: 1 primarily as a fumigant but can also be used as a dust. The best method of fumigating 
e temperature to 75 degrees for | hour before fumigating and raise the humidity by 
jalks. Quiet weather is desirable for fumigation. There should be a uniform concentra- 
ng period of time, requiring long intervals between doses. One pound of powder will 
)00 cubic feet of space. Mix | pound of powder with | pint of water and paint on as 
cattered throughout the house as it will cover. Keep the temperature near 75 degrees for 
1 then reduce temperature gradually. 
candles are available now and have given good results for controlling red spiders on car- 
chrysanthemums, It is desirable to use two applications, with the second ten days to two 
the original application. 
ozene 20 contains 20% azobenzene.and 10% DDT and is used as a dust. Light dusting applied fre- 
tly is 
oe 
s an azobenzene material available in pressure fumigators similar to Nicofume Pressure 
and are applied very similarly. Careful watch on the temperature is necessary as with other 
fumigation. | . 
was used extensively during the recent war. This material is a contact as well as a stom- 
| not kill red spiders, mealy bugs and aphids. In regards to red spider it has been re- 
kills off the parasites of this pest and thus increases the number of spiders. 
ed as a spray or dust. Probably the most common method of application is by spray- 
ate 50W at the rate of 1'/2 pounds to 100 gallons of water for the control of thrips and 
pplied to the soil DDT will control sowbugs, grubs, worms and hold down symphylids. 
va Brae can Repoiras wil show leaf injury. Carnival is one variety that will show this leaf 
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