24 BULLETIN 964, U. S. DEPARTMENT OF AGRICULTURE. 
NATURAL ENEMIES. 
Repeated observations have shown that because of the alertness 
and saltatorial habits of the nearly grown nymphs and adults of the 
garden flea-hopper their chances of being attacked by natural enemies 
are somewhat meager. The nymph in the earlier stages, however, 
is known to be less active and is frequently attacked by the larva of a 
small red predacious mite of the family Erythraeidae. The writer 
also reared a number of egg parasites which have been determined 
by A. G. Gahan as representing the following species : 
Anaphes perdubius Girault. Tetrastichus sp. 
Gonatocerus sp. Anagrus armatus nigriventris Gir. 
Westwoodella americana Ashm. Abbella subflava Gir. 
These species have been reared from the eggs of the garden flea- 
hopper collected from the alfalfa fields where the outbreaks occurred, 
and the parasites were believed to have rendered an appreciable 
amount of good. 
REMEDIAL AND PREVENTIVE MEASURES. 
Since the garden flea-hopper has an extremely wide range of food 
plants, though alfalfa is one of its favorite hosts, rotation as a remedy 
would be out of the question. Clean culture, however, to prevent 
hibernation in weeds and trash was found to result favorably in 
controlling the overwintering adults and is the most adequate means 
thus far devised of reducing the numbers of the pest. 
In alf alf a fields where outbreaks of the garden flea-hopper occurred 
it was observed that timing the removal of the crop so as to destroy 
the eggs was a vital factor in control. Although a small percentage 
of the eggs is laid near the ground, the larger proportion is deposited 
in the delicate leaves and petioles. Some of these leaves containing 
eggs drop to the ground, it is true, and in numerous cases these eggs 
hatch; nevertheless, timely cutting will remove the larger number, 
and this measure is recommended in controlling an outbreak. 
DUSTING AND SPRAYING TESTS IN THE FIELD. 
A dusting experiment was conducted in one of the alfalfa fields 
where an outbreak of the garden flea-hopper occurred, the damaged 
crop being cut and removed from the infested field. An area of 100 
square feet was selected and treated thoroughly with a mixture of 
air-slaked lime and flowers of sulphur in equal proportions. The 
mixture was thoroughly applied with a hand duster, one application 
being made in the morning and another at midday. Repeated 
observations by the writer after the dusting was completed failed to 
show that the treatment had been effective on any stages of the flea- 
hopper. 
In the same field a plat of similar size was treated with a spray 
solution composed of potassium sulphid and water at the rate of 1 
