314 INJURIOUS INSECTS, WITH TREATMENT 



maggot infesting the flower-buds, where they consume the contents 

 of the ovary. 



Preventives. Cut the first crop for hay as early as possible, 

 thus destroying the undeveloped larvse of the first brood. In the 

 latitude of Illinois this should be done before June 25. 

 SEED-CHALCIS (Bruchophagus funebris). A white grub found in- 

 side the seed. 



Preventive. Same as for FLOWER-MIDGE, above. Destroy all 

 volunteer clover plants. 



SEED-CATERPILLAR (Enarmonia interstictana) . A small whitish 

 or orange caterpillar infesting the heads. 



Preventive. Early cutting of first crop, as for FLOWER-MIDGE. 

 ROOT-BORER (Hylastinus obscurus). Small white grub burrow- 

 ing in the roots. 



Preventive. Plow under badly infested fields as soon as pos- 

 sible after cutting. 



HAY-WORM (Hypsopygia costalis). A brownish caterpillar three- 

 fourths inch long, infesting stacked or stored clover. 



Preventive. Remove old clover hay before putting in the new. 

 Place stacks on log or rail foundation, and salt the lower layers. 

 (Illinois Experiment Station.) 



Corn. CORN-ROOT APHIS ( Aphis maidiradicis) . A bluish green aphis 

 infesting the roots. 



Preventives. A short rotation period in corn, especially in dry 

 years. Deep and thorough and repeated stirring of old corn 

 ground in fall and spring as a preparation for corn-planting. 

 Maintenance and increase of the fertility of the soil. 

 WHITE GRUBS (Lachnosterna spp.). The large white curved larvae 

 of the common June beetle. 



Preventives. Rotation of crops ; do not let corn follow sod, 

 but let a crop of clover or clover and oats intervene. To help 

 clear sod land of grubs, pasture to hogs any time between April 

 and October. To prevent laying of eggs in corn-field, keep the 

 ground free from weeds during May and June. Thorough cul- 

 tivation and heavy fertilization. 



NORTHERN CORN ROOT- WORM (Diabrotica longicornis] . A whitish 

 grub two-fifths inch long, which burrows in the roots. 



Preventive. Crop rotation ; corn should not follow corn. 



