. Insect pests of farm, garden and orchard . y spraying the trees with kerosene emulsion dilutedwith five parts of water, or with miscible oils or lime-sulfurmixture. Such a spraying will also protect the fruit-trees fromthe mite, and will destroy numerous other insects, such as thepear-leaf blister-mite, which hibernates upon the trees. Suchsmall insects, so minute as to usually escape notice, are oftenresponsible for a poor growth, and should be properly checkedwhenever known to be injurious. INSECTS INJURIOUS TO CLOVER 211 The Pea-louse * Although this aphid is worst as a pest of peas (see
. Insect pests of farm, garden and orchard . y spraying the trees with kerosene emulsion dilutedwith five parts of water, or with miscible oils or lime-sulfurmixture. Such a spraying will also protect the fruit-trees fromthe mite, and will destroy numerous other insects, such as thepear-leaf blister-mite, which hibernates upon the trees. Suchsmall insects, so minute as to usually escape notice, are oftenresponsible for a poor growth, and should be properly checkedwhenever known to be injurious. INSECTS INJURIOUS TO CLOVER 211 The Pea-louse * Although this aphid is worst as a pest of peas (see page 322for full account) it passes the winter on red and crimson cloverwhich occasionally are seriously injuivd. In the spring of 1900,both red and crimson clover were badly injured in Delaware,Maryland and Virginia, while in DeKalb County, Illinois, -con-siderable acreages were entirely destroyed in August, 1903, andmore or less injury has been done since then. Where peas areavailal)lc the aphides migrate to them in the spring, but other-. FiG. 151.—The pea-aphis: 1, winged viviparous female; 2, wingless vivip-arous female—greatly enlarged. (After Folsom.) wise they continue to multiply on the clover. In late fall theyreturn to the clover upon which the eggs are laid, in which stagethe winter is passed, though in open winters many of the viviparousfemales live over winter on the clover. Control.—This is another pest which is usually held undercontrol by a fungous disease, and as the fungus does not developin dry seasons, with dry weather the ajjhis increases unchecked,while with a normal rainfall it is usually held in suljjection,Unfortunately we are unable to predict the weather probabilities,and when the aphides are found present on clover in considerable* Macrosiphum pisi Kalt. Family Aphididce. 212 INSECT PESTS OF FARM, GARDEN AND ORCHARD numbers, the only thing to tlo is to cut and cure it as soon as pos-sible, before serious damage has been done. The drying of the
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