Effect of temperature and different extracts of Datura metel leaves on some biological aspects of Hyalomma schulzei (Acari: Ixodidae)

Abstract

The current study investigated the effect of temperatures (28, 35 and 40) ° C Under 90 % R.H and alkaloids, phenolic and terpenoid extracts of Datura metel leaves at different concentration on biological performance of Hyalomma schulzei. The result indicated that egg hatchability was 97% at 28 and 35° C., incubation period was 30.66 days at 28° C the premoulting period for larvae and nymphs were (10.7-14.7) and (18.2-23) days respectively. Preoviposition period was 11.33 days at 28 °C while oviposition period was 21days at the same temp. Total egg production was (8848-8850) eggs and female converted 56.1% of engorged weight into eggs irrespective of temp. Bioassay results revealed that crude alkaloids, terpenoids and phenolics compounds of Datura metel leaves have an acaricidal effects on different developmental stages of Hyalomma schulzei. The mortality of eggs and starved larvae was 90% in all used conc. Of alkaloid, terpenoid and phenolics, the same mortality percentage was exhibited by fed larvae in all conc. Of alkaloid and terpenoids, however, mortality rate of starved and fed nymphs were 74.21% and 64.41% respectively in alkaloid extracts only. Moreover, terpenoid and phenolic extracts have no impact on adult females and males mortality. The outcome of the present study proved that alkaloid extracts of Datura metel. Leaves could effectively control different life stages of Hyalomma schulzei