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Anew Turfgrass Insect Pest7 ANew Turfgrass Insect Pest 7 BY JOHN C. SCHREAD AND ALEXANDER M. RADKO Entomologist, Connecticut Agricultural Experiment Station, New Haven; and Director, Eastern Region, United States Golf Association Green Section, respectively. uring droughty seasons, insect activity To what extent this insect has been D normally is greater on turf areas causing injury, we at this time have no than during wet seasons. The 1957 season precise information, but it has been in the Northeastern States was one of found in great numbers in dense turf record breaking droughts; New York areas, and most abundant on Merion blue- City reported it to be the driest in 131 grass turf and bentgrass putting greens. years, and so it follows that general in- Golfers have complained about them as sect activity was unusually high on turf they have been disturbing on putting sur- in these areas of the Northeast. faces where they seem to be attracted to Sod webworm and cutworm infesta- the golf ball. Superintendents have noted tions were particularly heavy last season, them and have asked for identification of while beetle grubs and chinch bugs oc- this fly which acts somewhat like the curred only at random in localized areas. leafhopper. The purpose of this article is There was, however, one insect that was to identify this insect pest and to pro- exceedingly more prominent in '57 than vide something of its known background during previous years, and to some de- in agriculture. gree was evident on almost every golf Frit flies are considered to be common course visited by members of the North- insects and one or more species may be eastern Green Section staff. This was the collected rather easily by sweeping with "frit fly," Oscinella frit (L). It is also an insect net. Certain head and wing called the "grain fly." characteristics readily esta.blish individ- USGA JOURNAL AND TURF MANAGEMENT: JULY, 1958 29 uals as belonging in the Dipterus family time J. Fletcher reported its presence in Chloropidae. To the naked eye, the adult Canada. In 1913 Criddle detected three looks like a miniature housefly. summer broods. The first brood occurred The common name of this insect pest is from June 12 through July 13 (heaviest derived from its activity on grain crops. between June 25-30); the second July 16 The larvae destroy immature kernels of through July 26; and the third from Au- grain, in many heads they eat out almost gust 10 through August 28." (1) every kernel; such light and worthless The larvae or maggot stage of this kernels the Swedes called "frits," hence species is short, thick, and cylindrical in the common name of this fly. appearance. The mouth parts which con- The extremely active adults of the sist of stout hooks are designed princi- more than 25 known species are for the pally for tearing and rasping plant tis- most part bare, without many hairs or sue. The maggots of the late fall brood pubescence, black to slightly pale in overwinter in the mined stems of grass color, with short to very short wings. and grain. "Injury caused by the frit fly The adult fly generally ranges from 1.1 can be easily mistaken for that caused to 2 mm. in length. by the Hessian fly due to the similarity The "frit fly" which occurred so com- of attack. Larvae of the frit fly are dis- monly on Merion bluegrass and on bent- tinguished from the larva of the Hessian grass putting green surfaces during the fly from the fact that the former are lo- summer of 1957 was identified by the cated in the center of the stem and crawl United States National Museum in Wash- actively when removed, while the Hes- ington. Owing to the difficulties some- sian fly larva is between the bases of the times experienced in separating specifi- leaves and is extremely inactive. The frit cally one species from another, it is well larva often causes the central leaf to turn to have specimens reviewed by Museum brown and die while leaves about it re- experts rather than rely on a superficial main green. In cool moist weather, the examination or snap judgment in naming insect may be abundant and yet only a them. few plants will show this symptom. Since Some of the species of "frit flies" dis- the larva does not usually cut the cen- play a rather wide variation in habits. A tral leaf entirely off in periods of low number of them are common in meadows transpiration, the leaf will remain green and other grassland areas where the for some time, whereas the same injury ground cover is allowed to grow rank in hotter and drier weather would kill and uncared for. Others infest the stems the leaf at once." (1) of wheat, oats, rye, clover, in addition to "Adults of the frit fly are rare on grain lawn and golf course grasses. Some live after it has begun to shoot-up to head, or in the wounds of lesions made in plants on grasses approaching maturity; how- by insects while others spend their feed- ever, they are abundant on wheat and ing period in excrement. There seems to grass that is in the early stage, stooling, be at least one or two species which are or producing new shoots. Bluegrass lawns troublesome to man and animal. One is that are sprinkled and mowed yielded known as the "eye gnat." It is reported frit flies practically all season." (1) The as tormenting to man and domestic ani- attraction of the frit fly for new shoots mals in certain areas of southern Cali- unquestionably explains its heavy infes- fornia, and may be partly responsible for tation in two of our most prolific pro- the transmittal of pink-eye disease of hu- ducers of new shoots in turf grasses- mans. Another species spreads Naga sore Merion bluegrass and creeping bentgrass. and conjunctivitis or sore eye in India. Control of "frit flies" may be obtained Oscinella frit, the species which could, by spraying infested turf and sod land under favorable conditions, develop into with DDT. The insecticide can be used a serious golf green pest is widely dis- in a wettable powder or emulsion form. tributed throughout the United States, Dusting with a 10 per cent DDT formula- and appears to be essentially destructive tion may be expected to produce good to grasses belonging to the family Grami- results in control. Treatments for the neae. "In 1889 H. Garman of Kentucky most part will kill adult flies and ex- reported first occurrance of the 'frit fly' posed maggots. The latter stage, however, in the United States. About the same in addition to the flies should be effec- 30 USGA JOURNAL AND TURF MANAGEMENT: JULY, J958 tively controlled when individuals come REFERENCE CITED in direct contact with DDT treated vege- (1) Aldrich, J. M., U.S.D.A.; European tation over a period of several or more Frit Fly in North America, Journal Of weeks subsequent to treatment. Agricultural Research, Vol. 18, 1920. Superintendents Award $1,900 from Scholarship and Research Fund total of $1,900 in scholarships and re- These latter are placed in the field of A search grants will be placed this general turf research. In a more specializ- year by the Golf Course Superintendents ed field, a $500 Grant will be made to the Association Scholarship and Research University of Wisconsin, Madison, Wis., Fund. Directors of this organization for the field of Nematode research. awarded a $400 Scholarship to Purdue This year will mark the third year of University, two $100 Scholarships to operation of the GCSA Scholarship and Pennsylvania State University, and four Research Fund and emphasizes the in- separate research grants. terest and need for training in the field Continuing with a program started in of turfgrass management and a.dditional 1951 at University of California at Los specialized turf research. It is expected Angeles, the school will have the second that additional funds will be placed this Research Grant of $250 for work on Ki- coming fall. The Fund was organized kuyugrass control. The Georgia Coastal through the efforts of the Golf Course Plain Experiment Station at Tifton, Ga., Superintendents Association and shares will receive a $250 research grant, Kan- offices with the GCSA in St. Charles, sas State College at Manhattan, Kans., Ill., but operates entirely separately from will also receive a $250 research grant. that organization. Kent Potts, left, Agronomy student at Texas A. and ~I. College, receives a $200 Trans- Mississippi Golf Association Scholarship from Dr. Marvin H. Ferguson, Mid-Continent Director and National Research Coordinator of the USGA Green Section. Potts and another student, Carlton Gipson, are studying the effects of different types of golf shoes-spike, lug-sole and ripple-sole, on turf used for golf greens. The awards were presented at a recent meeting of the Student Chapter of the American Society of Agronomy at the college. USGA JOURNAL AND TURF MANAGEMENT: JULY, 1958 31.
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