62 BULLETIN 746, IT. S. DEPARTZUEXT OF AGRICULTURE. 
No other parasites were found during the succeeding two years, 
and it would appear that they have died out. but the discovery of 
the single puparium proves that they will successfully parasitize the* 
sugar-cane moth borer in Louisiana. It is believed by the writers 
that the parasite might be of much benefit in controlling the borer if 
it were introduced in larger numbers. If this had been possible, 
much might have been accomplished, but conditions in 1916 and 1917 
prevented further experimental work. 1 
If the introduction of beneficial parasites can be undertaken later, 
it would seem advisable to station two men in Cuba to collect the 
parasites and one in Louisiana to receive them and ultimately to 
release them on the plantations. In 1915 investigations were con- 
ducted from February to September, but it appears that the most 
favorable season is from April to September, inclusive. 
RECOMMENDATIONS. 
1. Scraps of cane left about the factories and derricks after the 
grinding season should be destroyed by burning or otherwise. Cars 
in which cane is shipped, especially if they go into noninfested terri- 
tory, should be kept free of such scraps. 
2. Seed cane should be planted in the fall, if possible, and kept 
as deeply covered as practicable. Extraordinarily deep planting is not 
advocated, but as borer moths fail to emerge from cane under more 
than one-half inch of compact soil care should be taken to keep the 
seed cane well covered to that depth as a minimum. A heavy rain 
will sometimes wash the earth from the seed cane from one end of a 
row to the other, and in this case it is important to cover the cane 
again as soon as possible, especially in the spring, when the moths are 
emerging. 
3. Cane for shipment to points beyond the infested area should be 
selected so as to obtain it sound and free of borers, or if this is im- 
possible it should be soaked, previous to shipment, for at least an hour 
in Bordeaux mixture - or a solution of nicotine sulphate. 3 
1 Since the manuscript for this hulletin was submitted a number of sugar planters in 
Louisiana have agreed to contribute a small amount each to enable work in Cuba to be 
done. This action made it possible for the senior author to spend some time in Cuba in 
191S. He collected and sent to New Orleans about 650 puparia of the tachinid Eusenil- 
liopsis diatraeae, which were received and cared for by Messrs. E. R. Barber and W. G. 
Taggart. Several generations were reared during 1918, and it seems that the parasites 
will become established if they can stand the Louisiana winter. 
The junior author, who was in Cuba in 1915, is no longer connected with the investi- 
gation, having accepted a position under the Federal Horticultural Board. 
2 The formula for Bordeaux mixture is as follows : 
Sulphate of copper pounds 6 
Quicklime do 4 
Water gallons— 50 
Dissolve the sulphate of copper in 1 gallon of hot water and slake the lime in another 
vessel with an equal quantity ; reduce the latter to a creamy milk of lime and add slowly 
to the copper solution, stirring constantly. Finally, add water to make up the 50 gallons. 
3 One part nicotine sulphate (40 per cent nicotine) to 500 parts water. 
