FLORIDA STATE HORTICULTURAL SOCIETY 
65 
thought best to repeat the experiment. 
On September 20th the same trees were 
sprayed again and an additional row in¬ 
cluded. On the trees sprayed once Sep¬ 
tember 20th there were on September 
29th, 676 dead and 23 living adult fe¬ 
males, 19 almost mature females beneath 
other scales and 117 crawlers and 126 
eggs. On December 7th there were 13 
living females on 15 leaves. The trees 
had vastly improved in appearance and 
few scales could be found. 
Two Applications .—Three per cent 
sprayed August 16th and September 20th. 
Examined September 29th. On 25 leaves 
there were 696 dead and 4 living adult fe¬ 
males, 22 almost mature females under 
other scales, 19 crawlers and 10 apparent¬ 
ly normal eggs. On December 7th there 
were not enough scales present to make a 
count. The tree had improved in appear¬ 
ance. 
Check .—December 7th. On one leaf 
there were 25 living adult females. The 
scale generally was most abundant and 
had defoliated many of the trees. 
All of the tests with 3% of oil were 
made on sour seedlings about 4 feet in 
height. The tests with 2% were made on 
small sour seedlings and both budded and 
sour seedlings about 6 to 8 feet in height. 
The tests with 1 % were made on budded 
trees about 8 feet in height. While great 
care should be exercised in using strong 
dilutions of oil emulsion to bearing trees, 
one application containing 2% of oil is 
reasonably safe if the fruit is iy 2 or 2 
inches in diameter. 
conclusion 
From the foregoing tests and experi¬ 
ments the following conclusions may be 
drawn: 
1. A single spraying with a mixture 
containing 1% of oil is not satisfactory. 
2. Two sprayings are not satisfactory 
if given at an interval of only two weeks. 
3. Two may be fairly satisfactory if 
most thoroughly applied at an interval of 
about six weeks. 
4. Three applications of 1% may be 
satisfactory to control this pest. 
5. One application containing 2% of 
oil will produce satisfactory results if 
thoroughly applied. 
6 . One application of 3% will also 
produce satisfactory results, if applied 
thoroughly. 
7. Neither 2% nor 3% will give satis¬ 
factory results if carelessly applied. 
Krome: If Mr. Yothers’ subject is 
of as much interest to the other members 
of the society as it is to me, and if the 
Florida red scale has done to others as it 
has done in my grove, I am quite sure that 
some of the members might wish to ask 
some questions. I am sure he would be 
glad to give you any information you 
might wish. Mr. Yothers, does the 3% 
injure the fruit in any way? 
Yothers: I should have brought that 
out in my paper. It was used on nursery 
trees, but I used the three applications of 
1% on bearing trees that had fruit on 
them. 
