570 The Insect and Allied Fests of the Hop. [oct., 



apterous insects, have acquired the name of "Shy Bugs" 

 in Kent. Their winter stage is unknown. 



Remedies. — No washes have so far been found of any use 

 for such insects unless so potent that they damage the hops. 

 Growers should look out for any undue incursion of this 

 insect, and then at once have the bines jarred to collect the 

 young before they become winged. 



The Hop Jumper or Frog Fly. 

 (Euacanthus interruptus, Linn.) 



This is another bug which is far better known amongst hop 

 growers than the former. It does not appear to have been 

 known to the older writers on hops, however, nor has it been 

 noticeable to any marked extent during the past fourteen 

 years. 



The Hop Jumper or Frog Fly first became prominent in 

 1865, and seems to have increased in some parts of Kent and 

 Hants up to 1890, and in the last ten years of that period 

 it did considerable harm in a few districts. It was quite 

 serious at Alton in 1881, and it was said to become abundant 

 there every other year. Like the Needle-nosed Hop Bug, 

 this "Jumper" feeds by sucking out the sap, mainly from 

 the leaves. The result is that the leaves turn yellow and cause 

 a so-called "yellow blight." Later the foliage goes brown 

 and falls, and growth may be completely arrested. If the 

 bine is full of vigour it may grow right away from the attack, 

 but if it is slack, little or no crop may be the result. 



The leading shoots cease to revolve, just as in the Calo- 

 coris attack, and the leaves curl up. The bine is also 

 punctured, and little beads of sap exude, as in Calocoris 

 injury. 



The life-cycle is unknown, but it is almost certain that 

 young are hatched in late summer and hibernate in any con- 

 venient shelter. It is the young larvae that are first noticed 

 on the hops, and they moult their skins, which remain 

 attached to the leaves. A later moult brings them to the 

 nymph stage, in which they are still active and continue to 

 feed. The adult is most agile, jumping for a considerable 

 distance when disturbed. 



The perfect insect, shown natural size (PI. I., Fig. 7), varies 

 in colour. The commonest form is yellow, with long dark 



