BOARD OF HORTICULTURE 



161 



While the names of these various insects infesting the strawberry roots may 

 at first appear coiifusing, the injury each does and the appearance of the hirvae 

 are distinctive. The larvae are uot grub-like, but are longer, more slender, of a 

 distinct reddish color aud with a browu head. Wheu mature they are less than 

 half au inch in length. They feed almost entirely withiu the crown, usually 

 minmg just withiu tlie bark. constructiug long tuunels either up aud down or 

 arouud the crown. Others tuuuel directly through the crown or eise up aud down 

 the cork-like interior of the root. Still other larvae are found feeding in the 

 whorl of leaves at the growing tip of the crown, and a few have beeu observed 

 miniug in the petiole of the leaves. 



1. 

 root. 



FIG. — . 

 Adult motlis. 

 (Original.) 



STRAWBERRY ROOT BORER (SESIA RUTIil^ANS) 

 2. Strawberry plant showing larva. 3. Larva in its taurrow 



in tlie 



The adult of this crown miner is a small moth, resembliug very closely in 

 general appearance the peach t\A'ig miner, Anarsia lineatella. It is a weak flyer 

 and very sluggish in its movements. The eggs are deposited on the sheaths about 

 the crown, on the uuderside of the leaves, and along the leaf petioles. They are 

 usually pushed well down aiuong the fine hairs. The egg is white with a dull 

 lustre, a slight area at the smaller end being transparent. The surface of the egg 

 is ribbed and pitted, very much resembliug the bull of a r>eanut. The egg is 

 elongate, flattened at the larger end, the edges rounded. From the base eud it 

 gradually increases in size to near the middle, then slopes down to a blunt 

 rounded point. It measures .55 mm. long and .29 mm. wide. 



Remedial Measures 



Plowing up the infe.sted plants is the method of treatment recommended. 



It would seem that possibly the young larvae on hatching from the egg might 

 feed on the leaf or petiole before entering the crown and could be successfully 

 poisoned with an arsenical spray. 



Sig. 6. 



