42 BULLETIN 716, U. S. DEPARTMENT OF AGRICULTURE. 
{Henicospilus) antarikarus Saussure, A panteles simpllcis Viereck, and 
a tacliinicl fly from Mauritius. Jarvis (83) states that Diatraea sac- 
charalis " appears to be under effective natural control in Queens- 
land.*' while Mr. Frederick Muir has told the writers that this is the 
case in the Philippine Islands also. 
REPRESSION. 
EXPERIMENTS AND OBSERVATIONS IN ARTIFICIAL CONTROL. 
DESTRUCTION OF SCRAPS OF CAXE LEFT AFTER GRINDING. 
One of the chief places of hibernation of the moth borer is in 
scraps of cane left about the plantation. The wise manager will 
therefore collect such scraps as soon as possible after the grinding 
season and destroy them. On a plantation on which many scraps 
had been left about the mill and the derricks from one season to the 
next the infestation was practically 100 per cent over the whole- 
plantation. 
After the scraps are collected they may be disposed of by a very 
thorough burning with oil or some dry material. Throwing the 
scraps into a lake or other body of water is not to be recommended, as 
some of the moths may emerge from the floating stalks or from those 
which are washed ashore. Passing the scraps between the rollers of 
the mill has been recommended, but this would hardly be practicable 
on the ordinary plantation. 
CUTTING OUT " DEAD HEARTS." 
The dead plants, or " dead hearts." which follow the work of the 
moth borer in the spring, contain for a few weeks the larvse which 
have killed them. A familiar recommendation has been to cut out 
these dead plants and burn them, care being taken to cut to or even 
below the surface of the ground so as to secure the larvae. 
The writers had an opportunity of observing this work in prog- 
ress on a large scale at the State penitentiary farm at Angola. La., in 
the spring of 1917. The cutting of the ;; dead hearts " was being done 
very efficiently by convicts. They collected the dead plants in bags 
and burned them on the headlands. It was the opinion among the 
foremen that the " dead hearts " should be cut out of each field three 
times during the early growing season. One man was said to cover 
4 acres per day. 
The writers made a point of revisiting the penitentiary farm in 
the fall to ascertain the results of the work. It was found that the 
average infestation of the whole plantation was 31.5 per cent, which 
for 1917 was not extraordinarily low. Around Port Allen. La., for 
instance, the average infestation was 30.7 per cent, and the " dead 
