Life table parameters of Tetranychus urticae (Trombidiformes: Tetranychidae) on four strawberry cultivars

Shimaa, Fahim, Faten, Momen, El-Sayed, El-Saiedy (2020): Life table parameters of Tetranychus urticae (Trombidiformes: Tetranychidae) on four strawberry cultivars. Persian Journal of Acarology 9 (1): 43-56, DOI: 10.22073/pja.v9i1.5477

Life tables of the predatory mite Typhlodromus negevi feeding on prey insect species and pollen diet (Acari: Phytoseiidae)

The developmental time, survival, fecundity and life table parameters of the predacious mite, Typhlodromus negevi Swirski and Amitai were determined on four different food types, eggs of Bemisia tabaci Gennadius, Insulaspis pallidula (Green) and Phoenicoccus marlatti Cockerell as well as castor bean pollen Ricinus communis L. at 28±1 °C, 75±5% RH under laboratory conditions. Total developmental time of T. negevi females was 6.0, 7.7, 7.8 and 6.3 days on B. tabaci, I. pallidula, P. marlatti eggs and pollen grains, respectively. The total egg production rates were the highest on pollen and eggs of B. tabaci (32.9 and 21.2 eggs, respectively). A diet of pollen grains showed a higher values of the net reproductive rate (RO =29.04), intrinsic rate of increase (rm =0.271) and finite rate of increase (λ=1.3124) per day than eggs of B. tabaci, I. pallidula and P. marlatti . A diet of P. marlatti eggs resulted the lowest total fecundity which resulted in the lowest the net reproductive rate (RO =3.609), intrinsic rate of increase (rm =0.094) and finite rate of increase (λ=1.098) per day for T. negevi . The sex ratio of the progeny was strongly female biased (female/total=0.88, 0.85 and 0.80) when pollen grains, eggs of B. tabaci and I. pallidula were provided for T. negevi

Acaricidal Potentials of some Essential, Mineral and Plant Oils against the Predacious Mite Neoseiulus cucumeris (Oudemans) (Acari: Phytoseiidae)

The direct toxicity of some essential, mineral and plant oils to the eggs and females of the predacious mite Neoseiulus cucumeris (Oudemans) was tested in the laboratory. Sweet basil oil was the most toxic essential oil to females N. cucumeris, while sweet marjoram oil was the least toxic one (LC50=2.315 and 7.021%, respectively). In contrast, rosemary oil was toxic to eggs of N. cucumeris, while sweet basil oil was the least effective oil against predator eggs (LC50 = 2.695 and 11.950%, respectively). The mineral oil capl-l 1was the most toxic one to adult females (LC50= 0.849%) while natur'l oil was the least (LC50= 4.691%), respectively. In contrast, natur'l oil was proved to be highly toxic to predator eggs while bio-dux oil was the least effective oil against the egg stage. Females of N. cucumeris suffered a depression in reproduction when females treated and fed on prey formerly kept on treated plant leaves with LC50 concentration of each oil used in our studies. Rosemary and sweet marjoram as well as bio-dux oils seem to be slightly harmful to N. cucumeris at (LC50) concentration of each oil