INSECT PESTS 



305 



Plum curculio 



reduce the damage. Infested leaders 

 should be cut and destroyed before the 

 adults emerge. 



Pine Bark Aphid: Aphids with 

 cottony wax secretion form white patches 

 on bark, sucking the sap. Spray with 

 kerosene emulsion. 



Pine Leaf Scale: White, pear-shaped 

 shells on leaves contain insects sucking the 

 sap. Occasionally kill small trees. Spray 

 with nicotine solution or kerosene emulsion 

 about the second week in June. 



PLUM 



Plum cur- 

 culio: Grub in- 

 fests the growing 

 fruit, causing it 

 to fall. Jar the 

 trees once a week, 

 for six weeks 

 after trees bloom ; 

 catch the beetles 

 on sheets and de- 

 stroy them. Also 

 spray during the 

 same period with 

 lead arsenate. 



Fruit Bark 

 Beetle or Shot- 

 hole Borer: See 



Peach. 



Plum aphids: Suck sap from under 

 side of leaves. Spray with nicotine solu- 

 tion and soap. 



San Jose Scale : See Peach. 



POPLAR 



Poplar Tent-maker: Larvae feed on 

 leaves and fold them together near ends 

 of branches, forming nests. Spray with 

 lead arsenate. 



Spiny Elm Caterpillar: See Elm. 



Tussock Moths: See Apple, Hickory 

 and Horse Chestnut. 



Poplar Borer: Larvae make large gal- 

 leries in wood of trunk. Dig out or inject 

 carbon disulphide into the burrow and 

 close the opening. 



Poplar and Willow Curculio: Larvae 

 tunnel in smaller , trunk and branches. 

 Destroy badly infested trees. Cut out 

 borers: inject carbon disulphide. 



Oyster-shell Scale: See Apple. 



POPPY 

 Aphids: Black aphids suck the sap 

 from stems and leaves. Spray with nico- 

 tine solution. 



POTATO 



NOTE — Potatoes require vigilant watch- 

 ing. Watch your crop for three par- 

 ticular enemies: The flea beetles and 

 adult Colorado beetles may appear soon 



after the leaves show above ground and 

 should be given attention. Larvae of the 

 Colorado beetle do not appear until about 

 the first of June. About July ist watch 

 for aphids and spray to eradicate the in- 

 cipient colonies before the aphids spread 

 over the whole field. Unless promptly 

 checked the aphids will ruin your entire 

 crop in a few days. 



Flea Beetle: 

 Small. black, 

 jumping beetles 

 eat holes through 

 the leaves. Spray 

 both upper and 

 under surfaces 

 heavily with lead 

 arsenate. 



Colorado Po- 

 tato Beetle: 



Both adult and 

 larvae devour the 

 leaves. Spray or 

 dust with lead ar- 

 senate. 



Three-Lined 

 Potato Beetle: 



Larvae feed upon 

 the leaves and 

 carry their black 

 excrement on 

 their backs. 

 Spray with lead 

 Colorado Potato Beetle arsenate. 



Potato Aphid 



Potato Aphid: Green aphids appear- 

 ing in large numbers suck the sap from the 

 shoots and under side of the leaves, causing 

 much damage. Spray with soap and 

 nicotine solution. 



PRIVET 



Privet or Lilac Borer: Larvae tunnel 

 in the stems. Remove and destroy in- 

 fested stems. 



