68 
1 c Notwithstanding the utmost care against the invasions oft 
noxious insects, occasional rotation of crops will probably he neces¬ 
sary, in which case the ground should ordinarily be plowed m mid- : 
summer, after the picking of the fruit. 
Id In establishing a new plantation, it is best that the new 
plants should be removed from the old field as early m spring as; 
possible, as a safeguard against the deposit of eggs upon them by 
noxious insects which may be hibernating in the held and awaiting 
the opening spring for oviposition. Occasionally it becomes nece»J 
sarv to take additional precautions against the tran 3 fei of the eggB| 
of iniurious species from old fields to new. kor this purpose the 
young plants should he set in the new held and allowed to remain! 
until the runners have started and taken root, after which tiM 
plants hrst set should be dug up and destroyed. In this way the 
held is finally stocked with plants which have not been previously 
in contact with those seriously infested. 
1 e. As a security against the transfer of eggs of insects laioi 
upon or about the roots of strawberry plants, it is sometimes adviSj 
able to wash these thoroughly after removal from the earth. 
2. Barriers to Progress. 
2 a. To prevent the entrance of hordes of injurious insects hki 
the army worm, the practice of plowing a furrow around the held 
(afterwards deepened, if necessary, with a spade) has been ionn< 
efficient. The insects accumulating in the furrow may be destroyei 
by dragging a log of wood along it, or by digging holes at interval : 
in the bottom of the furrow, in which the insects will accumulate 
where they may be easily crushed en masse. 
2 b. To prevent the spread of insects which are destitute c 
wings, and have but feeble locomotive power (like the crown-borer 
it is recommended that newly established fields be separated fror 
old by an interval of a few rods in width devoted to some otlid 
crop. I 
2 c. As a still greater security against such invasion from with 
out, the practice of establishing new fields at a considerable distanci 
from the old has been found especially useful. 
8. Capture and Direct Destruction. 
8 a. For some insects infesting the strawberry field, no cheap*' 
or more satisfactory method can be used than that of capture ar 
destruction by hand. 
8 b. Sweeping back and forth along the row with an ordinal 
insect net is a ready means of capture available for such exposij 
insects as do not cling closely to the plants. It may be used | 
advantage for those attacking the flower and fruit at a time vat 
less laborious measures are not allowable. 
8 c. For species of feeble locomotive power, which infest tl 
leaves in summer, after the fruit has-been gathered, it is a comiiK 
and very useful practice to mow the field in dry weather, burning . 
over in a brisk wind after it is thoroughly dry. 
