276 



JOURNAL 01' AGRICULTURE OF P. R. 



markings, and usually becomes very abundant wherever beans are 

 grown. 



Feeding on the leaves, the beetles when abundant strip them to 

 the veins and mid-ribs, causing great damage. They deposit their 

 yellowish-colored eggs in the soil around the roots of the plant. 

 These hatch in a few days and the whitish larv« that emerge feed 

 on the roots and nodules of the bean, causing additional damage. 



Control. — If, when the lieetles first begin to appear, the plants are 

 thoroughly sprayed with arsenate of lead, three pounds in fifty 

 gallons of water, little trouble will be experienced from them. 



BEAN LEAF-llOlT'KR { ?J))> poCL^CO mali) . 



T his le af-ho p p er, 

 known in the United States 

 as the apple leaf -hopper, 

 is always in great abun- 

 dance in the garden. It 

 attacks a great variety of 

 plants, but its greatest 

 damage is done to the 

 bean. 



The leaves of the bean 

 ai-e curled and distorted, 

 and the edges turn yellow 

 and dry up. This is 

 caused by the sucking of 

 tlic juices from the tissues, 

 ;ni(l results in a serious 

 stunting of the plants and 

 a consequent decrease in. 

 the yield. 



The hopper itself is a 

 small, delicate, green in- 

 sect with a life cycle of a little less than three weeks. This short 

 life cycle makes it possible to increase in numbers with extreme 

 rapidity. 



Control. — This insect is attacked by a fungus, Sporotrickum glo- 

 huHferum, which helps somewhat to keep it in check. The methods 

 given for controlling leaf-hoppers in general (page 27H) may be 

 used on' this insect with irood results. 



Fig. 31. 



-White Grub (Phyllophaga sp.). 

 Larva. 



