Factors causing losses of clover seed

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Abstract
Crops of white clover (Trifolium repens L.), alsike clover (Trifolium hybridum L.), and red clover (Trifolium pratense L.) were studied during 1958–60 to determine the effect of shrivelling, insect damage, and harvesting operations on seed yields. In individual crops the percentages of shrivelled seed ranged from 1–28 per cent in white clover, 1–44 per cent in alsike clover, and 23–54 per cent in red clover. Seed damage, caused mainly by clover case-bearer (Coleophora spp.) varied from 0–46 per cent in white clover and 0–17 per cent in alsike clover. No such damage occurred in red clover. Red thrips (Haplothrips niger Osborne) caused little darnage except on Motutapu Island where white clover was severely affected. Losses during harvesting varied from 42–75 per cent of plump seed in white clover and 64–74 per cent in red clover.

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