Full-text - Norsk entomologisk forening

Torgeir EdlandNO. OFOBSERVATIONSTIME OF DEVELOPMENT IN DAYSFig. 4. Relationship between temperature and time of development foreggs of E. transversa. Observations fitted to the equation d (t - to)= k (to w 6.0°C, k w 88).orological observations at Ullensvang), to is the developmentalzero, and k is a constant, the so-called thermal constant. Thecalculations showed that to .w 6" and k w 88.In Fig. 4 the fitted curve has been drawn and the data observedduring 1964 have been plotted. Although the curve fits the observationswell, it may be appropriate to draw attention tosources of errors in the experiments. The samples were checkedTable 111. Relationship between temperature and time of development ofeggs incubated at two temperatures, in 1963, compared to the calculateddevelopmental time (d (t f 6") = 88).Temperature"C20 130 1Observedtime ofdevelopmentin days7 1 4Hatchingobservedin numberof samples5 15i ( 13.6716.28Calculatedtime ofdevelopmentin days