242 VEGETABLE FOES AND DISEASES 



the ground should be deeply ploughed or dug, or, in 

 gardens, trenched. 



THE ILLUSTRATIONS REPRESENT PEA THRIPS AND EFFECT ON PEA 



PLANT. 



A, Pea Thrips : a, natural size ; b, enlarged twelve diameters. B, por- 

 tion of top of Pea plant infested with Pea Thrips : c, end of a 

 shoot in which the leaves and flower buds are all shrivelled or 

 dried up, checking further growth ; d, blooms completely crip- 

 pled by the punctures of the thrips and incapable of develop- 

 ment ; e, pods that have been formed, but contorted by the 

 action of the thrips, and further growth arrested. C, pod 

 partially developed : f 9 apical half shrivelled and contorted ; 

 g, surface wrinkled by the punctures of the insects. The 

 longest dots on the leaflets and other parts of the portion of 

 top indicate the thrips. 



BEAN AND PEA BEETLES (B ruckus granarius and 

 B. fist). 



The Bean Beetle is a little more than one eighth 

 of an inch long, colour black, with brown hairs and 

 various white spots, tip of tail prolonged and covered 

 with grey down ; head drooping, mouth forming a 

 kind of wedge-shaped beak, wing-cases pitted with 

 small dots, front legs reddish. 



The Bean-seed Beetle lays its eggs on the young 

 seed vessel in the Bean blossom, and from these eggs 

 the maggots or larvae hatch, and shortly eat their way 

 into the growing Beans. Each maggot gnaws a gallery 

 for itself and remains in the closed-up tunnel, turning, 

 when full-fed, into a pupa, and thence into the beetle 



