Supplementary Report on Insects Affecting the Straioberry. 257 



method of warfare is to destroy the adults as they emerge, or as they resort 

 to the tield to lay their eggs. 



3e.. As a general measure of protection, it is sometimes expedient to rake 

 and burn the mulch and rubbish late in autumn, after insects have resorted 

 to their winter quarters. 



3/". For thousand-legs in the strawberry field, the plan of scattering slices 

 of potatoes or other vegetables between the rows, and killing by hand late at 

 night and early in the morning the myriapods attracted to them, has been 

 recommended by good authority. 



Zg. Thick-stemmed weeds in and about the field should be destroyed if the 

 stalk-borer is likely to be injurious. 



4. Topical Applications. 



4a. For all leaf-eating species occurring in summer after the fruit in picked, 

 except, possibly, those which feed concealed within the rolled and curled 

 leaves, s^Drinkling or spraying with Paris green or London purple in powder 

 or suspended in water, is a feasible remedy. It must be remembered, how- 

 ever, that this method is of no avail against insects which do not gnaw or 

 bite the tissues of the plant. It is recommended to destroy the leaf-eating 

 beetles, whose j^oung are the strawberry root-worms. For this purj^ose the 

 poison should be applied during July and August. It is, of course, iiujiort- 

 ant that it should be used no more freely than is absolutely necessary to 

 accomplish the end desired. 



46. Powdered hellebore is used, like the arsenical poisons mentioned in 

 the preceding section, for the strawberry false-worm, Emphi/tus maeulatus. 



4c. For those species appearing exposed while the fruit is upon the plants, 

 as well as for all those which are not provided with biting mouths, powdered 

 pyrethrum is one of the most useful applications. This may be either 

 dusted upon the plants, due care being taken that it shall reach botli the un- 

 der and the upper surfaces of the leaves, or it may be thrown in a spray of 

 water from a hand force pump. 



4d. The kerosene emulsion may be applied for the same purpose as the 

 pyrethrum mentioned above, .except that it is not available during the fruit- 

 ing season. 



4e. Applications of sulj^hur to the leaves, as well as a spray of strong soap- 

 suds, are useful for some purposes. 



4/; For subterranean larvte appearing locally, bi-sul2)hide of carbon or 

 carbolic acid may be poured into small holes made in the ground, a.s rcconi- 

 mended on ancjther page under the discussion of remedies for the straw- 

 berry root-worms. 



The attention of the practical fruit grower is properly concentrated on the 

 relatively small number of insects known as po.sitively destructive, the other 

 species infesting his crops being regarded rather as .suspicious characters 



