42 



ground), and further treatment should should be given once a week for 

 several weeks, or until th; pla.nts are strong enough to resist attack. In 

 the case of radishes the treatment should be continued until the roots 

 are almost ready for the table. 



WHITE GRUBS AND WIREWORMS 



White grubs and wireworms which are the larvae of the June beetles 

 and the Click beetles respectively are often troublesome in gardens, 

 particularly to the tubers of potatoes. TJnfortuaiately these insects arc 

 difficult to control. Ploua-hinof infested/ land in late autumn will disturb 

 many of the insects \vhen in an immature stage and expose them to frost 

 and other destructive agencies. In spring when the ground is again plough- 

 ed or dug up, all grubs seen should be picked up and destro^^ed. If at this 

 time pigs are turned into the infested gardens they \vill find these insects 

 and devour them. 



THE CARROT RUST FLY 



In many parts of Eastern Canada, in some seasons, considerable in- 

 jury is done by this insect, which was introduced from Europe many 

 years ago. The adult two-winged fly is about a quarter of an inch long, 

 of a bright, shiny, greenish-lilack color, with yellow legs and red eyes. 

 Early in the season the female deposits her eggs on or near the roots and 

 the little yellowish maggots soon hatch and attack the roots, which tney 

 eventually tunnel in every direction. When the leaves of carrots begin tlo 

 turn reddish, the roots \vill raiost likly be found to be infested by these 

 maggots. Two broods at least occur during the season. When carrots are 

 finally harvested and stored for winter use the}* are often found to con- 

 tain brow^nish burrows where the m.aggots have been working. 



REMEDIES. When young carrots are being thinned out, the spray- 



ing of the remaining plants with ordinary kerosene emulsion, one part in 

 nine of water, has been found of value as a 'protection against injury by 

 this insect. Applications should be made every week during June and 

 July. Sand impregnated ^vith coal oil has also been found useful and 

 may be scattered along the rows every week. About half a pint of coal oil 

 is sufficient for an ordinary pailful of sand. The odor of coal oil is dis- 

 liked by the flies and the object, therefore, is to make the plants objec- 

 tionable so tjhat they will not visit them for the purpose of depositing 

 their eggs. In our experiments we have found that carrots so\vn as late 

 as the third week in June were of good size and quality in addition of 

 course to being free from injury by the Carrot Rust fly. 



