Vegetable Plant Lice 



ii 



DIAGRAMMATIC LIFE HI5T0&Y0F THE PLANT L0U5E 



THE NYMPH5 

 DEVELOP INTO 

 WINGLESS FE- 

 MALES WHICH 

 GIVE BIRTH TO 

 LIVING YOUNG. 

 SOME OF WW 

 ARE WlHGED 

 A*/D OTHERS 

 WINGLESS 



EGGS ABE LAID ON WEEDS, 

 GRASS STUBBLE, BUSHES, 

 REMNANTS OF VEGETABLE 

 CROPS, FRUIT TREES, ETC., 

 IN THE FALL . THEY REMAIN 

 OVER WINTER AND HATCH 

 IN EARLY SPRING 



THE NYMPHS HATCH 

 FROM THE EGGS AND 

 FEED ON SAME PUNTS 



THE RETURN 

 MIGRANT PRO- 

 DUCES MALES 

 AND FEMALES 

 WHICH MATE. 

 THE FEMALE 

 LAYS A FEW 

 EGGS 



W/A/GED LICE 

 NWQRhTETQ 

 \EQE TABLE 

 CROPS ON 

 WHJC H BOTH 

 WIWCFDMO 

 WINGLESS 

 Lief ARE w 



PRODUCfOA 

 J2T 



POTATO 

 TOMATO 

 EGG PLANT 



PEAS 

 BEANS 

 SPINACH 



CABBAGE 

 CAULIFLOWER 

 BR. .SPROUTS 



AFTER MANY 

 GENERATIONS 

 &ETURH MIGRANS 

 ARE PRODUCED 

 IN THE F ALL 

 AND FLH TO 

 PLANT WHERE 

 OVERWINTERING, 

 E COS ARE TO 

 ^BELAID / 



MELONS 



CUCUMBERS 



SQUASH 



Fig. 7 



Diagrammatic Life History of the Plant Louse 

 (See bottom of page 10) 



