Spraying Experiments in Nebraska 
11 
SPRAYING EXPERIMENTS FOR THE CONTROL OF INSECTS 
CODLING MOTH 
It has long been known that spraying with arsenical poisons at 
the proper seasons of the year will almost, if not quite, eliminate 
codling moth injury, and it is generally conceded that arsenate of 
lead is the best form in which to employ the poison. However, a 
great deal of discussion has arisen as to time and manner of apph- 
cation in order to secure the greatest efficiency. 
In order to spray efficiently, a knowledge of the life history 
and habits of the insect is necessary. This knowledge was obtained 
by consulting the work of entomologists in this and other states, 
and by observations made as follows: 
In the early spring, larvae were collected from near-by orchards 
and from storage houses in Lincoln, placed in cotton stoppered test 
tubes and kept at a temperature equal to that of their natural 
habitat in the orchard. The tubes were examined every second 
day and notes taken on the duration of pupal stage, dates of 
emerging of moths, etc. 
Six sprayed and six unsprayed trees were banded with burlap 
in such a way that the larvae, either ascending or descending, would 
be trapped. These larvae were collected and treated as stated 
above. In addition, careful notes were taken in the orchard on 
dates of appearance of rnoths, larvae, and pupae. Two mature 
trees were enclosed with window screening; and the moths collected 
were released inside, where they could be carefully studied and the 
larvae collected so that reliable data could be obtained from which to 
determine the proper dates of application. 
Fig. 2 — Cage in which codhng moths were studied 
