No. 4.] INSECTICIDES AND FUNGICIDES. 209 



The remedy for the larvns of the above insects is rotation, 

 plantinof only on land that has been clean-cultivated at least 

 two years to escape the May beetle, and not planting two 

 seasons consecutively on the same land to escape the black 

 paria. 



To destroy the black paria in its beetle form, and also the 

 leaf blight, the Bordeaux mixture and Paris green, one pound 

 to one hundred gallons, should be used : first, as soon as 

 the growth begins in the spring, throwing the licjuid down 

 among the crowns of the plants with as much force as pos- 

 sible ; second, spray just before the blossoms open, with 

 the same. 



As soon as the fruit has been salhered, it will be more 

 profitable to turn under the plants at once, thus checking 

 the development of this insect. The new plantation, which 

 should have been planted in the spring and some distance 

 from the fruiting field, must be sprayed with the Bordeaux 

 mixture and Paris green two or three times during the 

 summer to keep the paria and leaf blight in check. 



Potato. 



Of the insects and fungi attacking the potato, the Colorado 

 beetle {DorypJiora decemlintata^ needs no introduction or 

 description, and the potato blight and rot (yPliytophtliora 

 iiifestans) is also more familiar to you than is pleasant to 

 contemplate. The former is destroyed by Paris green and 

 the latter by the Bordeaux mixture. With a barrel pump 

 the combined mixture, one pound to one hundred or two 

 hundred gallons, may be applied very cheaply, and both 

 pests kept under control. The Victor pump is arranged so 

 that five rows may be sprayed at one time. In our ex- 

 perience with this pump, however, two nozzles in the hands 

 of a quick man walking behind it will distribute the 

 materials to belier advantage than by the fixed nozzles ; for, 

 if the rows are not very even in distance, some of the foliage 

 will be left unsprayed. "With the ordinary barrel pump, if 

 two nozzles are used, one man walking behind or sitting in 

 the cart may cover eight or even ten rows at one time. The 

 first application should be made as soon as the larvte of the 

 potato beetles begin to appear. Subsequent applications 



