Abstract
In order to control turfgrass-injurious insects, it is necessary to well know species, their abundance and process of generation on turfgrass ground, and to take proper action at the suitable time for the control.
By installing trap lamps in four golf links, the authors investigated species of injurious insects to be collected and their seasonal prevalence to determine a pattern of search of turfgrass-injurious insects.
In Tomei Golf Link, Pediasia (Crambus) teterrellusZincken, and Japanese lawn grass cutworm, Rusidrina depravataButler, were most abundant and further common cutworm, Agrotis fucosaButler, and black cutworm, Agrotis ipsilonHufnagel, were collected in small number.
In scarabs, Aphodius rectusMotschulsky was most collected, and other scarabs collected were abundant in order of soy bean beetle, Anomala rufocupreaMotschulsky, and black chafer, Lachnosterna kiotoensisBrenske. A relatively large number of striated chafer, Anomala testaceipesMotschulsky, was collected.
A species of crane fly, being a kind of most injurious insects to turfgrass, collected.
Emergence of imago was twice a year, spring and fall. The number of species of insects collected in this golf link is the most among the investigated four golf links.
In Hamaoka Golf Link, Anomala schönfeldtiOhaus was most abundant, and insects collected was abundant in order of soybean beetle, Anomala refocupreaMotschulsky, and brosted chafer, Melolontha japonicaBurmeister.Anomala schönfeldtiOhaus is a most injurious insect to turfgrass. The reason why the collected number of bluegrass webwormPediasia teterrellusZincken, and Japanes lawn grass cutworm, Rusidrina depravataButler, is few, is that both insects are intensively being controlled. Besides them, sugar-beet aphomia (Aphomia sapozhnikoviKrulikowsky) were collected in a large number.
In Hakone Golf Link, striated chafer, Anomala testaceipesMotschulsky, was most collected, followed by soy bean beetle, Anomala rufocupreaMotschulsky and cherry chafer, Anomala daimianaHarold. The reason will be that a many number of Japanese cypress and cedar which are food for imagoes of striated chafer, Anomala testaceipesMotschulsky, are growing around there. Many Japanese lawn grass cutworms, were collected, but the generation of bluegrass webworm, was very few, for the reason that the low temperature of Hakone due to its altitude would inhibit the generation of this insect.
In Ohya Golf Center, next to bluegrass webworm most collected, Japnese lawn grass cutworm, Rhyparus azumaiNakane, spotted chafer, (Blitopertha ozientalisWaterhouse) and chestnut brown chafer (Adoretus tenui-maculatus Waterhouse) were collected in this order. The reason of few species and less generation of scarabs are that the foods for these imagoes are lacking on and around the turfgrass ground in this golf center.
