1907.] Insect, Fungus and other Pests. 



415 



these being caught in a receptacle placed underneath con- 

 taining paraffin. This sieving or screening, however, fails 

 to reach grains that contain eggs or developing larvae. The 

 same objection can be urged against the practice of screening 

 under a strong air blast, for infested grains will still to some 

 extent remain behind. 



(3) For cargoes in ships, ventilate throughly, keeping down 

 the temperature and keeping the grain dry. 



During the past month the number of species of insects 

 and fungi forwarded for identification, which have not hitherto 

 been dealt with in these notes or in the 



Flies. — Specimens of the wheat midge (Cecidomyia tritici) 

 were sent from Avoch, Ross-shire. A note on this pest appeared 

 in the Journal for September, p. 353. One of the difficulties 

 of dealing with this insect, lies in the fact that it may also breed 

 in a number of wild grasses. All hedgerows and waste spots 

 of ground should therefore be kept well trimmed where an 

 attack of C. tritici has been experienced. 



Maggots in Mushrooms. — Referring to the note at the foot of 

 P- 353 of the September issue of the Journal, the fly has now been 

 bred out, and has been found to be a fly belonging to the family 

 PhoridcB, or hump-backed flies. These insects feed on decaying 

 vegetable matter and dead insects, while live insects and snails 

 may also be attacked. 



Specimens of the onion fly (Phorbia cepetorum) were received, 

 from a correspondent at Glasgow, where onions and leeks were 

 being attacked on sandy soil. This pest is dealt with in 

 Leaflet No. 31. 



* Notes on insect, fungus and other pests, dealing with the specimens submitted 

 to ihe Board for identification, and their apparent prevalence, will arjpear in this 

 Jozirna! month by month, The notes commenced with the issue for June, 1907. 



R. Stewart MacDougall. 



Notes on Insect, 

 Fungus and Other 

 Pests.* 



Board's leaflets, has been less than during 

 August, and for this the season is no 

 doubt largely responsible, farmers, 

 gardeners, and fruit growers being excep- 

 tionally busy. 



