THE PECAN LEAF CASE-BEARER. 
19 
Table XIV. — Spraying experiments against the larvss of the pecan leaf case-bearer at 
Monticello, Fla., in 1913. 
Plat No. 
Number 
of trees. 
Treatment. 
Date of 
application. 
Results. 
VI 
VII 
55 
14 
Paste lead arsenate at 3 
pounds plus Bordeaux 
mixture 4-5-50. 1 
Check; unsprayed 
Apr. 18,1913 
Not controlled satisfactorily. About 
50 per cent of the larvse were de- 
stroyed, but the buds were badly 
injured. 
Most buds were infested by larvse. 
Some trees were nearly defoliated. 
1 Bordeaux mixture was used for fungicidal purposes. 
Table XV. — Spraying experiments against the overwintering larvx of the pecan leaf 
case-bearer at Monticello. Fla., in 1914. 
Plat No. 
Number 
of trees. 
Treatment. 
Date of 
application. 
Results. 
IV 
10 
Commercial lime-sulphur 
solution at 1 gallon to 40 
gallons of water. 
Apr. 2, 1914 
Not controlled. Some few larvae killed, 
but the majority continued to feed 
upon the buds and foliage. 
Not controlled. Much damage done 
V 
10 
40 per cent nicotine sul- 
phate at 1 part to 700 
do 
to the buds and foliage. 
parts of water. 
VI 
25 
Paste lead arsenate at 3 
Apr. 2 and 10, 
Not satisfactorily controlled. Manv 
pounds to 50 gallons of 
1914. 
larvae killed, but sufficient numbers 
water (2 applications). 
escaped to inflict serious injury to 
buds and foliage. 
As shown in Table XIV, a single application of paste arsenate of 
lead at 3 pounds to 50 gallons of Bordeaux mixture, made on 
April 18, 1913, failed to control the pest, although there was 
considerable benefit in favor of the sprayed over the check trees. 
Table XV shows that on trees treated with commercial lime-sulphur 
solution at 1 : 40 and 40 per cent nicotine sulphate at 1 : 700 on 
April 2, 1914, at which time the larvae were emerging from their 
hibernacula, little or no benefit was derived from the treatment. 
Compared with the checks, the trees in Plat VI, which received two 
heavy applications of paste lead arsenate at 3:50 on April 2 and 10, 
showed that there was much in favor of the treatment, but sufficient 
numbers of the larvse escaped the poison to do serious damage to 
the buds and foliage. 
On account of the manner in which the larvae feed upon the buds, 
it was found to be difficult to kill a large proportion of them before 
considerable damage had been done to the foliage. Results show 
that spraying with lead arsenate during the spring can not be relied 
upon as an effective remedy for this pest. 
SPRAYING EXPERIMENTS AGAINST LARVAE IN THE SUMMER. 
Experiments at Monticello, Fla. 
After discovering the manner in which the larvae attack the foliage 
during the summer, spraying experiments were conducted to find 
out if the case-bearer could not be controlled practically at this 
stage of its life cycle. The results of this fine of work are embodied 
in the following tables. Table XVI shows the effect of the treatment 
of 113 ten-year-old pecan trees in the orchard of the Summit Nurseries. 
