PROCEEDINGS OF THE SECOND ENTOMOLOGICAL MEETING 243 
ments (3) and (4). _Experiment (3) gave better results than (4) at equal 
strengths, the flies in (3) dymg within 36 hours whilst those in (4) lived 
for more than four days. It was found in practice that 3 ounces of Lead 
Arsenate gave as good results as 5 ounces, so that 3 ounces were used in 
all later experiments, but the Lead Chromate was used at a strength of 5 
ounces in 4 gallons of gur solution. In the case of (5) the flies lived for 
more than a month, so that Lead Chromate is not effective as a poison. 
In 1916 a preventive course of spraying was given to peach-trees at 
Pusa in April, but a practical difficulty was found in the rapid drying 
up of the droplets of solution. 
Instead of spraying directly onto the leaves, which of course requires Mr. Fletcher. 
to be renewed every few days and immediately after every shower of 
rain, it is possible to hang up in the trees bundles of twigs or similar 
traps, dipped in the solution and provided with a tin roof to keep off 
rain. You will find a general réswmé of this subject in the Canadian 
Entomologist for 1914 and that may give you some useful hints. 
As regards knowing when the flies are about, the attraction of citro- 
nella oil is useful, but that of course attracts only the males and is of no 
use for direct control. Citronella also exercises a,very specific attraction 
and we have already seen that half-a-dozen different species may occur 
in peaches. 
The second means of control, the employment of natural parasites, 
has been tried in other countries but not yet in India. I spoke of this 
point before and need now only say once again that we are badly in 
need of information regarding these parasites and you can all help in 
this by sending us in specimens of those you rear or of affected fruits 
for us to rear out the flies and parasites here. 
The third method of control, the destruction of the larvze in the 
attacked fruit, is an obviows remedy as regards the succeeding crop, 
but it must be properly carried out to be effective. It is not of the slight- 
est use to simply throw the affected fruit down on the ground or to bury 
it under a shallow depth of soil. Experiments have shown that a pro- 
portion of flies will emerge from puparia situated as much as five feet 
below ground. The affected fruit must therefore be buried deeply or 
rotted in water where the larvee cannot escape or, better still, collected 
and boiled. ‘This must be done before the larvee have escaped and regular’ 
collection and destruction of fruit is therefore required in orchards 
and fruit-gardens. 
As regards control by destruction of attacked fruit, there was a very Mr. T. V. Rama- 
bad attack of Melon Fruitfly (Dacus brevistylus) at Coimbatore a couple krishna Ayyar. 
of years ago. The early attacked fruits were picked and destroyed and 
the result of this treatment was promising. 
See 
