EXPERIMENT STATION BULLETINS, 



161 



not escape. The moth, shown 

 in Fig. 6, is dark brown in 

 color, except the hind-wings, 

 which are pale 3'ellowish. 

 The eggs are laid in clusters 

 on the foliage and the young 

 larvae, at first hairy but 

 later naked, soon scatter 

 over quite wide areas. When 

 full grown, the larvae are 

 yellow in color with three 

 broad, black, longitudinal 

 stripes, those on the sides 

 being cut up by fine white 

 lines. The pupal stage is 

 passed underground. Two 

 generations are brought 

 forth each vear, the most de- 

 structive one in June and 

 Julv. 



Fig. 6. — Zebra caterpillar. (After Riley, Second Rep. In- 

 sects of Mo.) 



Cut-worms. 



A goodly number of cut-worms feed on the beet. As yet, they have 

 been but little studied in Michigan but all of them respond to the same 

 treatment. 



See Insects affecting Sweet-corn. 



REMEDIES. 



Spray with paris-green and lime, using one pound to one hundred and 

 seventy-five gallons of water. If the insect appears on cabbages or on 

 some otber vegetable where poison would not be permissible use Fyre- 

 thrum or one of the kerosene-emulsions. 



Cabbage Plusia (see Insects Affecting the Cabbage). 



Woolly-bear (Spilosoma virginicn) . 



Oftentimes, one finds large, hairy caterpillars among the beets. They 

 are light yellow in color and they eat the foliage of the beets voraciously. 

 Such caterpillars turn into good sized moths or millers. Hand picking 

 will usually be found to suffice for them, but when necessary, they may 

 be kept in check with one of the arsenites. 



e 



Beet Leaf-miner (Pegomya vicina). 



One often sees on the leaves of beets, raised or discolored blisters 

 which on closer examination, are found to be made by insects that have 

 tunnelled out passages between the ui)per and lower skins. Such blisters 

 or tunnels are called mines, and the insects that make them are called 

 leaf-miners. On the beet we have such leaf-miners, the larvae or mag- 

 gots of which make irregular blotch mines of small size. When full- 

 grown, the larvae usually desert the leaves and pass through the pupal 

 stage under fallen leaves or in the soil. The adult fly, or parent form, 

 looks very much like a house-fiy except in size, being about half the size 

 21 



