172 Relation of Grass Insects to Cult hated Crops 



The rainfall is normally about 24*5 inches annually, falling chiefly in 

 winter and spring. 



The locality is well sheltered on all sides by belts and clumps of trees, 

 chiefly elm, lime, ash and oak, and these, with the woods of the neigh- 

 bourhood attract birds which, in their foraging doubtless destroy 

 numbers of insects harmful alike to grass and arable land. 



On the newly broken up grassland it was noticeable that pigeons, 

 rooks, jackdaws, plovers and starlings spent most of their time, in pre- 

 ference to the older arable fields the insect life of which had attained its 

 normal level. 



Grasses grow very luxuriantly here so that there is abundance for 

 such insects as infest them, hence the effect of insect migration is felt 

 continuously. 



IV. HARVEST TO SPRING SOWING— WINTER PERIOD. 



Table of Insects Feeding and Host Plants. 



1. Coleoptera: 



Agriotes obscurus, L. 



Athous haemorrhoidalia, F. 

 Melolontha vulgaris 



2 Hymenoptera : 

 (Unidentified) 



3. Lepidopfera : 



Apamea secalis, Bjerk. 



Triphaena pronuba, L. 



Agrotis exclamationis, L. 



4 Diptera: 



Cecidomyia destructor, Say. 



Cecidomyia spp. 



Host 

 Arrhenatherum avenaceum 

 Dactylis glomerata 

 Lolium italicum 

 Cynosurus cristatus 

 Lolium perenne 

 Agrostis stolonifera 

 Poa pratensis 

 P. trivialis 



Galls on Agropyrum repens 



Dactylis glomerata 

 Agrostis stolonifera 

 liOlium perenne 

 Poa pratensis 

 Trisetum flavescens 

 T. flavescens 

 Poa pratensis 

 Lolium perenne 

 L. perenne 

 L. italicum 



Agropyrum repens 

 Dactylis glomerata 

 Agropyrum repens 

 Dactylis glomerata 

 Lolium perenne 



