White Potato 



205 



The elongate oval orange eggs are deposited In small masses 

 on the underside of the leaves. The larvae, known as " slugs," 

 are about % inch long, red, with the head, legs and two 

 rows of spots on each side black. When mature, the larvae 

 enter the ground and pupate. There are usually two broods 

 annually. Control: Spray with paris green, 1 lb. in 50 gals, 

 water to which 2 lbs. lime should be added to prevent burn- 

 ing of the foliage. Paris green may be applied also in the 

 form of a dust, 1 lb. in 20 lbs. air-slaked lime, or use arse- 

 nate of lead (paste), 3 or 4 lbs. in 50 gals, water. It is best 

 to apply the poison in bordeaux mixture except when it is 

 not necessary to use this fungicide for the control of diseases. 

 In the home garden the beetles may be hand-picked into a pan 

 containing a little kerosene. This insect is the familiar "po- 

 tato bug." 



Theee-lined-potato beetle {Lema trilineata) . — A yellow 

 leaf-beetle, about % in. long, marked on the wing-covers with 

 three black stripes. The eggs are laid in clusters on the 

 underside of the leaves. The grubs are yellowish, with the 

 head and legs black and about % in. long when full grown. 

 Control: Spray with arsenicals as for the Colorado potato 

 beetle. 



Potato aphis (Macrosiphum solanifoUi). — Plant-lice, some 

 of which are green and others pink. They attack potatoes, 

 causing the leaves to curl and turn brown; in some cases the 

 death of the plants may result. Control: Spray with % pint 

 " Black Leaf 40 " tobacco extract in 50 gals, bordeaux mix- 

 ture. In case bordeaux mixture is not needed for the control 

 of diseases, use the " Black Leaf 40 " in water, adding 3 or 4 

 lbs. soap. The spraying should be done with great thorough- 

 ness, using plenty of material, and care should be taken to 

 hit the underside of the leaves. Begin early, before the plants 

 become too badly infested. 



Apple leaf-hopper (Empoasca mail). — A small pale yel- 

 lowish green leaf-hopper, % in. long, that sometimes attacks 

 potatoes. The eggs are inserted into the tender parts of the 

 potato plant and the nymphs feed on the underside of the 



