Abstract
In the field, porina (Wiseana spp.) larvae were individually isolated and each fed weighed amounts of white clover (Trifolium repens) leaves until pupation. The experiment was carried out over 2 consecutive years. In 1969 the average nightly intake of white clover (green weight) for a healthy larva increased from 0.0078 g in May to 0.0340 g in September. In 1970, the average nightly intake increased from 0.0068 g in March to 0.0226 g in September. The feeding behaviour of individual larvae was found to be very irregular. Over the approximate 8-month long subterranean stage, all larvae had at least one non-feeding period of one night or more, and in many situations this exceeded 10 consecutive nights. The mean number of larvae which fed on anyone night was 50% of the population.

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