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NEW YORK AGRICULTURAL EXPERIMENT STATION. 263 
SUMMARY FOR ORCHARD V. 
Although twenty infested trees were used in these experi- 
ments and unusual pains taken to make the applications thor- 
ough there were no beneficial effects apparent in either case. 
The scales were breeding as rapidly during the summer on the 
treated trees as on the checks. Although there was a week 
of dry weather immediately following the applications, the un- 
favorable results may have been due in large part to an unusu- 
ally wet spring. The heavy rains washed both compounds 
almost entirely off before the summer was over. Further experi- 
ments with these washes seem desirable as they have not yet 
been sufficiently tested to prove or disprove their value. 
GENERAL SUMMARY. 
The experiments with crude petroleum include 321 fruit trees 
consisting of apples, cherries, pears, peaches and plums. The 
results were fairly uniform. In the experiments of Series I no 
injury was caused by the 25 per ct. emulsion, but in every case 
the 40 and higher percentages caused serious injury to the plum 
trees while the pear and cherry trees were practically un- 
harmed. The younger and more vigorous plum trees were 
injured less than the old and weaker ones. 
The experiments included in Series II show serious injury to 
peach trees by the 25 per ct. emulsion and equally serious 
injury to plum and apple trees by the 40 per ct. emulsion. In 
all cases of injury it is to be noted that the most serious injury 
was caused by the fall applications and by two applications— 
one in the fall and one in the spring. These results do not agree 
with those of Smith and Corbett previously referred to but agree 
in the main with those of Felt who, as previously stated, found 
that the undiluted petroleum caused serious injury to the 
treated trees. 
The experiments to ascertain the percentage of petroleum in 
the petroleum and water emulsion required to kill the hibernat- 
ing scales also gave uniform results. The 25 per ct. emulsion 
failed to affect the scales materially while the 40 per ct. killed 
