Toxicity and Biological Activity of Five Plant Extracts to the Two-Spotted Spider Mite, Teteunychus urticae and Predatory Mite, Amblyseius swirskii (Tetranychidae: Phlytoseiidea

Abo-Taka, Safaa M.; Sweelam, M. A.; Heikal, H. M.; Walash, Imam H.

doi:10.21608/ajesa.2014.163845

Toxicity and Biological Activity of Five Plant Extracts to the Two-Spotted Spider Mite, Teteunychus urticae and Predatory Mite, Amblyseius swirskii (Tetranychidae: Phlytoseiidea

Document Type : Original research articles

Authors

Economic Entomol. and Agric. Zoology Dept., Fac. of Agric., Menoufia Univ., Egypt.

10.21608/ajesa.2014.163845

Abstract

To avoid the bad effect of synthetic insecticides, botanical products are useful tools against pests. Therefore, ftve plant extracts were tested to evaluate their toxicity effect against Tetranychtis urticae Koch as pest and its predatory mite Amblyseius swirskii Athias-Henroit. These plants are red pepper, garlic, seena-L, galls, and thyme. The effect of plant extracts on some biological aspects of T. urticae was studied. Five concentrations of each extract were used 1, 2, 3, 5 and 6 %. LCso of both field and susceptible strain was calculated, in addition to slope and tolerance ratio. The effect of LCso and LCso of field strain on some biological aspects was studied. Red pepper extract exhibited a high degree of efficiency against adult female of T. iirticae with overall mean mortality ranged from 24.46 - 98.56 %; while the lowest was thyme recorded overall mean mortality ranged from 0.00 to 66.86 % for 1 to 6 % concentrations, respectively. As for predator
A. swirskii overall mean mortality of red pepper was the highest recording 33.99 to 89.52 % with 1.29 % LCso, whilst galls and thyme extracts recorded the least mortality. There are significant differences between red pepper and other extracts in incubation period; where mean of incubation period was 7.27; while there are no significant differences between the other four plant extracts. Duration of larval stage was prolonged to 6 days in red pepper treatment. All hatched larvae died in garlic treatment and can’t develop to protonymph. Females in red pepper treatments can’t deposit eggs and died, while life cycle was prolonged to 14.75, 15.97, and 15.79 days for galls, thyme, seena-L, respectively in comparison with 10.47 days in control. LC30 of tested plant extracts prolonged incubation period of T. urticne especially in red pepper and garlic treatments, in comparison with control. Garlic and red pepper extracts registered the longest period of life cycle compared with control 10.4 days. Females at garlic treatment died after 6 days without laying eggs, while males lived for five days then died. Female longevity was shortened to 10.89 days in red pepper comparing with 14.67 days in untreated females. Furthermore, few eggs were laid in all treatments in comparison with control.

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