The biology and control ofColeophoraspp. (Lepidoptera-Coleophoridae) on white clover

Abstract

The overwintering larvae of Coleophora spissicornis Howarth and C. alcyonipennella Kollar are in diapause during 1 winter only, and pupate in the following spring. It is concluded that in general the larval progeny of the first-brood moths do most of the damage to seed crops. C. alcyonipennella, which is usually numerically dominant in the first brood flight period, is the more injurious of the 2 species. In a field test at equivalent dosages both DDT and toxaphene gave good immediate control of the moths present, DDT being slightly superior.In a replicated experiment I application of DDT gave a nearly complete kill of the moths present at the time of spraying and increased the seedyield significantly. The residual effect of DDT is apparently of short duration. Further improvement in control, by sprays directed against the first-brood moths, will necessitate the application of more than I spray.

Management practices reduce casebearer (Lepidoptera: Coleophoridae) damage to white clover seed crops

“…This confirms Dumbleton's (1963) observations. However, in contrast to Dumbleton, I have found C. spissicornis~o be the numerically superior species and since the seed consumption of their larvae is about equal to that of C. jrischella I consider this species to be the more damaging.…”

THE BIOLOGY AND BEHAVIOUR OF THE CLOVER SEED MOTH COLEOPHORA FRISCHELLA (LEPIDOPTERA: COLEOPHORIDAE) IN TASMANIA

“…(2) (288) Larvae collected mid-winter and maintained in the laboratory at 22 k 1 '-C removed the silken webbing from both ends of their cases and crawled around their petri dishes in late August-September. Similar "spring movement" (Dumbleton 1963), was observed in the field in October-November.…”

“…This paper outlines field and laboratory observations made in Tasmania on the biology and behaviour of C. frischella from 1965 to 1972 and contrasts them to observations made in New Zealand by Dumbleton (1952Dumbleton ( , 1963, Stuart (1958) and Pearson (1975), especially.…”

“…To investigate Dumbleton's (1963) suggestion of a larval diapause in excess of 10 months, cages consisting of a metal cylinder 34.5 cm diameter (0.09 m2). 10 cm high with 5 cm driven into the soil and covered with orlon were placed at 20 sample sites in early November.…”

The residual contact toxicity to honey bees of insecticides sprayed on to white clover (trifolium repens l.) in the laboratory

“…in white clover seed crops. The most satisfactory control of this pest has been achieved by the application of insecticide sprays to the crop when in full flower (Dumbleton 1963) and therefore at the stage most attractive to honey bees. Field tests have shown that many of the materials that have shown promise for the control of the pest were too toxic to honey tees to make further work with them worth while.…”