Effect of temperature on development and reproduction in Gastrophysa viridula (Coleoptera: Chrysomelidae)

Abstract

Abstract. The duration of development, reproduction and longevity of Gastrophysa viridula (DeGeer) was measured at constant temperatures and a long day photoperiod. At 18, 21.5, 25, and 28°C the average duration of development ofthe egg, larval and pupal stages and total development time (28.2, 21.6, 16.1, 15.0 days) decreased with temperature hut the proportion of time spent in the egg, larval and pupal stages did not significantly change with temperature. Total development required 304.6 day degrees ahove the lower development threshold of 7.1°C. Pre-adult mortality and the rate of oviposition increased, and the duration of oviposition decreased with increasing temperature. Net reproduction rate Ro decreased (from 157 female eggs at 18°C to 75 female eggs at 28°C) and mean generation time T also decreased (from 45.5 days at 18°C to 24.1 days at 28°C) with increasing temperature. The intrinsic rate of population increase rm increased with temperature (from 0.111 at 18°C to 0.179 at 28°C). On a physiological time scale the average generation time T was 496 day degrees.

Gastrophysa viridula (Coleoptera: Chrysomelidae) and biocontrol of Rumex - a review

“…Temperature determines the duration of development (Honek et al 2003) (Table 2). At constant 18°C the mean pre-adult development time is c. 28 days, at 28°C its duration decreases to 15 days.…”

“…Thermal constants (Table 3), lower development threshold 7.1°C and sum of effective temperatures for total development 304.6 day-degrees were calculated. Statistical analysis revealed that the lower development threshold was common for all development stages: egg, larva and pupa (Honek et al 2003). The existence of an identical development threshold for all development stages is called rate isomorphy (Jarosik et al 2002) and is of great practical importance because it greatly facilitates calculating the thermal constants.…”

How to Compare the Lower Developmental Thresholds

“…Since the rate isomorphy is a consequence of equality among the lower developmental thresholds, statistical methods (Jarosik et al 2002(Jarosik et al , 2004Honek et al 2003;Shi et al 2010) were used for comparing the lower development thresholds. In this method, ratios of time spent in each developmental stage (proportion) at different constant temperatures were calculated from the data on the duration of development in a particular stage divided by the total pre-imaginal development (egg + larva + pupa).…”

Spectrum of the pests on cereal crops and influence of soil fertilisation

“…This drop could be caused by higher temperature during the year 2006. According to Honěk (2003), McAvoy and Kok (2004), the temperature influenced occurrence and development of the pests in crops.…”