30 Farmers’ Bulletin 1261. 
SUMMARY OF RECOMMENDATIONS. 
The dictyospermum scale may be controlled by spraying with an 
oil-emulsion spray during December, January, and February, using 
a strength of 1 part emulsion to 70 parts of water. Two applica- 
tions with a three-week interval are recommended. The same treat- 
ment is recommended for the pyriform scale. 
The avocado white fly may be controlled by spraying as the foliage 
is hardening in the fall, usually September, with an oil emulsion at 
a strength of 1 part to 70 of water and repeating the spray during 
the spring after the fruit has set, using a strength of 1 to 80. Where 
the branches are covered with the spray these two applications will 
suffice against the dictyospermum scale and the pyriform scale. 
The blossom Anomala may be controlled by spraying with 
powdered arsenate of lead at the rate of 14 pounds to 50 gallons of 
water. Care should be taken that the spraying outfit is fitted with a 
suitable agitator. 
The avocado blossom thrips may be controlled by spraying with 
40 per cent nicotine sulphate solution at the rate of 1 part to 900 parts 
of water plus 3 pounds of soap to each 100 gallons of the diluted 
solution. If thrips are abundant spraying should be repeated in from 
8 to 10 days. 
The avocado leaf-roller may be controlled by spraying with pow- 
dered arsenate of lead at the rate of 2 pounds to 100 gallons of water. 
A good agitator should be fitted to the spray tank to keep the poison 
in suspension. 
The avocado lace-bug may be controlled by spraying with 40 per 
cent nicotine sulphate solution at the rate of 1 part to 900 parts of 
water with the addition of 1 or 2 pounds of fish-oil soap to each 50 
gallons of the diluted spray. 
The avocado red spider and leaf thrips may be controlled while 
the fruit is still unpicked by using fish-oil soap at the rate of 5 
pounds to 100 gallons of water plus 40 per cent nicotine sulphate at 
the rate of 1 part to 900 parts of the diluted soap solution. After 
the fruit has been picked and the red spider and thrips are again be- 
coming injurious, lime-sulphur concentrate, 1 part to 60 parts of 
water or 1 to 75, depending on weather conditions, with the nicotine 
sulphate solution incorporated at the rate of 1 part to 900 parts of 
the diluted lime-sulphur solution, may be used. It is recommended 
that the oil-emulsion sprays should not follow immediately after a 
spraying of lime-sulphur as the oil-emulsion sprays possess a clean- 
sing quality and remove the lime-sulphur from the foliage. Burning 
is also likely to result. It is advisable to allow a three-week interval 
before application of any oil-emulsion spray, in order that the full 
benefit from the lime-sulphur application may be derived. 
