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Thc net consumed quantity of host sap was estimated by subtracting the weight loss of the food by evaporation from the tetal loss. The frequency ef piercing differed only little arnong diffbrcnt instar nymphs. The frequency of piercing in group rearing (5.2fhr) was more than twice as many as that in individual rearing (about 2/hr). The frequency of feeding seemed to be 1-2 per hr. The duration ef feeding ranged t'roni 3 min to more than 1 hr. The consumed quantity of food increased gradually from thc lst (2mg!day) to the 5th instar (8rnglday),and was usually a little higher in the female than in the male. The total amount of feeding throughout the nymphal stage was 82.54mg per bug. The quantity of feod consumed by the adultjust after emergenee (7.5mglday) was about equal to that of the 5th instar nymph, but soon it increased sharply up to 13mg per day, when the adult was 5 days old, Then it decreased rapidly to 4mg per day, whcn the adult was 12 days old, and thereafter remained nearly constant until 17 days old.

applied entomology and zoology

Studies on the Feeding Habits of Lygus disponsi LINNAVUORI(Hemiptera : Miridae) and the Injury to its Host Plant II. Frequency, Duration and Quantity of the Feeding