C IOWA AGRICULTURAL COLLEGE. 



so plenty as a week or ten days previously. The older Hungarian 

 was full of young bugs, many newly hatched. A portion of the field 

 was cut a week before this but bugs were plenty in the stubble. 

 Some of the grass still standing was nearly dry enough to burn. 



On August 13th the Chinch Bugs in the older Hungarian com- 

 menced to travel to the adjacent corn, the greater number of the 

 migrants being in the black larval and pupa states, though many 

 were younger and some adult. The grass would burn in places and 

 in such places great numbers of bugs could be killed, but in most 

 places there was too much green grass for it to burn readily. Fur- 

 rows detained many, and great numbers, particularly of the younger 

 ones, died in and at sides of the furrows. Some of the adult bugs 

 pairing at this time. On the 16th and for one or two days thereafter, 

 which were cool and cloudy, there was not much migration, and 

 while it continued to some extent for a number of days, at no time 

 did they travel so rapidly as on the 13th to 15th. From this time on 

 the bugs were at work in corn and Hungarian, but the corn was cut 

 as early as possible to avoid loss, and much of the younger Hungar- 

 ian was entirely destroyed so they were forced to scatter. As late as 

 November 15th however a few adult bugs were to be found in these 

 fields running over the surface of the ground or concealed under 

 sods, tufts of grass, etc. A number were found secreted in a cabbage 

 head between the outer leaves during the early part of December. 

 There is every reason to believe that immense numbers of them 

 have gone into Winter quarters in best of condition and that so far 

 as the condition of bugs is concerned they may prove far worse the 

 coming season than the season that has passed. 



REMEDIES TRIED AT AMES. 



KEROSENE EMULSION. A number of tests of this remedy were 

 made, first with a view to testing its value under various conditions, 

 and afterward for the sake of checking the damage threatened to 

 corn in some fields on the College Farm. 



The first trial was made July 15th, the emulsion used being the 

 common one consisting of kerosene, soap and water diluted to about 

 five per cent kerosene. The bugs were killed very quickly by this- 

 application, and great numbers of them could be reached but many 

 in particularly secreted places, in folds of leaves and under lumps of 

 earth escaped. Thrown upon the leaves and running down between 

 leaf and stalk, it dislodged and killed immense numbers. Thrown 

 against stalks where they were congregated it would quickly dislodge 

 the mass, and while it was impossible to see whether all driven off 

 in this way were sufficiently wet to kill them it was certain that most 

 of them w r ere. This application was at the rate of about one gallon 

 of emulsion or twelve gallons of the diluted mixture to five rows of 

 corn, for thirty-two rods or what would equal five gallons of 

 emulsion, sixty gallons of diluted mixture, to the acre, or a cost for 

 material of less than sixty cents per acre. In trials of emulsion 

 diluted to range from two per cent, to seven per cent, of kerosene, 

 less than four or five per cent, was found unsatisfactory, and at the 

 lowest figure bugs even when thoroughly drenched, and kept for a 

 timo in the fluid were able to recover. A mixture (about two per 



