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Show 168 Utah Academy of Sciences! Arts and Letters [Vol. XIV, Say's plant bug, Chlorochroa sayi Stal., occurs throughout the cultivated areas of Utah and is also common upon range land. This common pest attac.ks asparagus, beans, and certain other truck crops, though seldom causing such sve:e Injury as is found upon grain. The green soldier bug, Acrosternum hilaris (Say), occurs throughout the irrigated sections of northern Utah, and attaks peas, though it seldom causes serious injury. The plant bugs, Lygus elisus Van D., and L. hesperus Knight, also occur upon peas, as does th !alse chinch bug, Nysius ericae (Schil.), but these bugs usually peas, less Injury to peas than to potatoes and other truck crops which they also attack. The garden flea beetle, Halticus citri (Ashm.), feeds upon beans and peas and may cause some injury although this species has not as yet been found to occur in the more important commercial pea districts of northern Utah. cause Blister beetle adults of several kinds including Epicauta pmnsylvanica (De G.), E. vittata Fabr., E. maculate (Say), and Macrobasis oregona Horn cause slight damage to peas. The twelve spotted beetle, Diabrotica 12-punctat var. tenetta Lec., has been seen upon peas in parts of Washington and Kane counties, but it apparently does not occur in northern Utah where most com mercial fields are located. The banded flea beetle, Systena taeniata (Say), occurs wherever peas are grown in Utah, and at times causes some injury. Th hop flea-beetle, P sylliodes punctulata Melsh., a common pest of young sugar-beets, has also been found upon peas. Small numbers of adult pea weevils, Mylabris pisorum (L.), at times are found in the pea fields when The weevils feed upon the pollen the first field pea plants begin to bloom. of the pea blossoms, and the females deposit their eggs at the ·time the pods develop. Eggs laid upon the pods hatch in 9 to 10 days, the tiny larvae bur rowing through to enter the growing peas. Growth to maturity, which takes a little more than two months during warm seasons, occurs after the grubs Adult weevils may remain over winter within stored, enter the green peas. infested pea seeds, although some emerge and hibernate in or near the pea fields, in protected places. Weevil infested seed should not be planted unless it is fumigated or otherwise treated to kill the contained adult beetles. Control consists of fumigation or heat treating of all infested seed; careful harvesting of pea seed to eliminate waste peas and decrease infestation next to emerge; plow season; harvesting seed when mature, before weevils. begin Carbon harvst. in fields disulphide, material surface under following pea ing if used as a fumigant, should be applied at the rate of 8 to 10 pounds to each 1000 cubic feet of space (this liquid being placed in shallow pans on top of Pre peas) if bins are tight; more fumigant must be used if bins are leaky. is cautions to prevent fire or explosion must be taken when carbon disulfid Pea weevils do not continue to breed in dry seed, as do bean weevils. used. in The imbricated snout beetle, Epicoerus imbricatus Say, attacks pea plants Utah. The alfalfa weevil, Pkvtonomus posticus (Gyllenhal), prefers alfalfa, but it may feed upon peas and certain other legumes. The clover root bore, ThIS Hylastinus obscurus (Marsh.), occurs in Idaho and possibly in Utah. species attacks peas and several other legumes. The seed corn maggot, Hylemyia cilicrura (Rondani), frequently attacks some the germinating seeds of melons, beans, peas and cucumbers in Utah, The leafminer, Agromyza serpentine times making replanting necessary. water scutellata Fallen infests leaves of sweet pea, beets, clover, radish and be which in may occurs garden peas, melons. Leafminer injury occasionally Fallen. aeniventris caused by Agromyza Almost every season in Utah the alfalfa caterpillar, Eurymts eurythe host attacked, alfalfa (Bdv.), is abundant. Although alfalfa is the principal The larvae of are found upon pea and bean plants. also larvae caterpillar |
