. Annual report of the Missouri State Board of Agriculture. Missouri. State Board of Agriculture; Agriculture -- Missouri. INSECTS INJURIOUS TO CORN. 319 to allow the adults to emerge. It is quite different, however, with the states north of us, where there seems to be a good reason to believe that the winter is passed not only by the hibernating insects, but by the pupae, and occasionally by the larval stage. It will thus be seen that the army- worm in Missouri has three distinct broods each year, and that the winter is passed by hibernating adults only. The army-worm has its ups and downs, b
. Annual report of the Missouri State Board of Agriculture. Missouri. State Board of Agriculture; Agriculture -- Missouri. INSECTS INJURIOUS TO CORN. 319 to allow the adults to emerge. It is quite different, however, with the states north of us, where there seems to be a good reason to believe that the winter is passed not only by the hibernating insects, but by the pupae, and occasionally by the larval stage. It will thus be seen that the army- worm in Missouri has three distinct broods each year, and that the winter is passed by hibernating adults only. The army-worm has its ups and downs, but fortunately for the agri- culturists of any given region, it is more often downs than ups. It is a well known fact that the appearance of army-worms in great destructive numbers never has occurred in any given locality for two consecutive seasons. While the army-worm is with us in small numbers every year and can be readily found by a person searching for them in pastures and meadows and wheat fields, yet the insect is held in bounds by a number of foes, some of which will be discussed later on. It appears that it is only about once out of ten times that these natural enemies fail to do their duty, but when they fail, the army-worms succeed in multiply- ing sufficiently to cause the larvae to take upon themselves the habit of marching in great masses, and practically devour every green thing in their path. NATURAL ENEMIES. While the army-worms are greedily preyed upon by a number of dif- ferent birds, especially the robins and thrushes, and while poultry of all kinds thrive on this luxuriant food, and also while certain parasitic fungi and bacteria also kill numbers of the larvae and pupae, yet the great war. Fig. 61.—The Red-Tailed Tachina Fly, Winthcmia 4-pustulata, a parasite on the Army-Worm; a, the fly, natural size; b, same, much enlarged; c, army-worm on which the fly has laid eggs, natural size; d, parasitized army-worms, enlarged. (From Slingerland.). Please note
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