CONTROL OF GARDEN DISEASES AND INSECTS. 41 



CELERY CATERPILLAR. 



Wherever celery, parsley, carrots, or other plants of the celery 

 family are grown, a large green or yellowish caterpillar ringed with 

 black is sure to be found. It is known as the celery caterpillar (fig. 

 46) or parsley worm. It feeds normally on the leaves, but when 

 abundant attacks blossoms and undeveloped seed. When disturbed 

 the caterpillar gives out a powerful scent. 



Control. — The conspicuous appearance of this worm makes hand 

 picking easy. If the first brood is killed there will be little damage 

 from the second brood. Lead aisenate can be used when necessary 

 in large gardens devoted to a single crop of celery, parsley, or related 

 plants. 



■■■ TARNISHED PLANT-BUG. 



The tarnished plant-bug (fig. 15, p. 20) is one of the worst enemies 

 of celery. As a rule it does not do so much damage to other garden 

 plants. 



^ CELERY LOOPER. 



The celery looper ^ somewhat resembles the cabbage looper (see 

 p. 33) and has a similar life history. The same remedies may be 

 employed for it, especially arsenate of lead. The loopers also may 

 be collected by hand. 



CORN. 



Sweet corn is so badly infested by insects of many species that it 

 is undesirable to plant it in many cases, considering the difficulty of 

 obtaining good localities for its growth in small gardens. 



CORN ROOT-APHIS. 



The corn root-aphis is bluish green, slightly whitened by a waxy 

 bloom. It spends most of its life feeding at the roots, but winged 

 forms appear which migrate to various weeds, especially smartweed, 

 mustard, pigweed, and plantain. 



Control. — Crop rotation, with care not to plant in or near fields 

 of weeds, free use of fertilizers to stimulate plant growth, and dis- 

 turbing and destroying the nests of ants which attend this species 

 and foster it by carrying the young from one plant to another are 

 advisable. Fall plowing and late planting of corn are also useful. 



SOUTHERN CORN ROOTWORM. 



The larvae, or young, of the southern corn rootworm, known as bud- 

 Avorm and drillworm, do great damage to corn of all kinds and to 

 several other food plants, including peanuts. 



Control. — This is considered under the 12-spotted cucumber beetle, 

 page 44. Wlien occurring on corn, insecticides are of little value. 

 Injury is greatest to corn when planted in damp locations and 



^Autogrupha simplex Guen. 



