INSECTS INJURIOUS TO AGRICULTURE. 





while the Btalka are Bometimes tunnelled by the grub of a 

 weevi] (Baridius trinotatut § , as well ae th<- caterpillar 

 of Gortyna nit 



Injuring tho Cabbage, Radish, etc. 



The European Cabbage-butterfly (Pieris rapes Schrank). 

 - Feeding uol only on the outer leaves, but boring into the 

 heads in all directions, a green, velvety caterpillar with a 

 owish stripe along the back and side, and turning into 

 a white butterfly with four (male) or six (female) conspicu- 

 ous black Bpots. There are two broods of worms, the in 

 wintering as a chrysalis. It is held in check by a Chalcid 

 parasite (Pteromalus puparum Linn. . 



•M i^i - Di stroy the butterflies by capturing them with ;i hand- 

 net; trap the chrysalids by placing boards slightly raised from the 

 ground, under which the caterpillars may pupate; also sifl over the 

 cabbagi beads a powder composed of one part of pyrethrum diluted 

 with twontj parts of flour, or sprinkle a saturated infusion of pj rethrum 

 on the plants. Excellenl rem re applications of hot water, or a 



Bolution of one pound of \\ bah <>il soap dissolved in about six gallons 

 of water, or strong tar water. 



The Cabbage Plusia ( Plusia brassica Rilej >.— In August 

 and September, gnawing large, irregular holes in the lea 

 a rather large, pale-green 

 caterpillar, marked with 

 still paler, more opaque 

 lines, and with thre< 

 pairs of abdominal feel 

 being a semilooper, and 

 changing to a grayish- 

 brown moth, \v li o b e 

 wings are adorned with 

 a distinct Bilver mark 

 of interrogation, riu* .. , ' ,,,. . 



l- ig, US. —Cabbage bu - 



mothlavsher eggs singly e, eggs.— After m 



or in small clusters on either side of the 1< »ung 



worms feeding first on the outside leav< . i g 



asliori distance into the heads. There arc four bi 







\ x 



