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Siath Annual Report. 37 
_ fungus-covered bugs in your boxes for continued infection. Re- 
place the green wheat or corn as often as it becomes yellow, and 
_ keep the boxes replenished with healthy bugs from the field. 
TO INFECT A FIELD WITH THE WHITE-FUNGUS: DISEASE. 
After you are made certain by the increase of the number of 
_ bugs covered with the white fungus that the infection is work- 
_ ing in your boxes, you should gather from the boxes dead bugs | 
and live bugs, white-fungus covered and non-white-fungus cov- 
ered, and scatter them in the field where the bugs are the 
thickest, in the axils of the leaves and at the bases of the stalks. 
_If the weather be dry, certain spots may be prepared in the 
a field by laying corn-stalks or other vegetable refuse on the ground 
in sufficient quantity to produce shade and retain moisture, and 
thus form a favorable center for the propagation of the disease. 
Such spots would be excellent starting-places for field infection, 
as has been suggested by Professor Forbes. 
If the fungus-covered bugs are abundant in the infection — 
boxes, the earth might be taken from half of the boxes, to- 
_ gether with the bugs, and scattered in the field. The earth 
should be replenished as often as removed. You should always 
take care, however, that some white-fungus-covered bugs re- 
main in your infection boxes. As fast as the bugs are taken 
from the infection boxes they should be replaced by fresh bugs 
from the field. Continue to scatter bugs from the infection box 
over the field at intervals of two days or less, until it is seen 
that the bugs are dying rapidly all over the field. 
CONTINUED CARE OF BOXES. 
If after a time the infection boxes should give off a smell of 
ammonia, from the decay of bugs or bits of wheat or corn left 
in the boxes, the boxes should be cleaned out, earth and all, 
and, after airing a day, started anew as at the beginning. 
Keep the earth in the boxes moist, but never make tt muddy. 
Sometimes other fungi than the white Sporotrichum appear 
a on the bugs in the boxes. The only annoying one likely to 
appear is a yellowish-brown one known as Aspergillus. This 
fungus does not kill the bugs, but it may take possession of 
“a ger 
| their dead bodies and become detrimental to the growth of the 
- white fungus. If the Aspergillus should appear extensively in 
