Abstract
Field experiments were conducted to determine the efficacy of three predators- Phytossulus persimilis, Neoseiulus californicus and Orius albidipennis, two pathogenic fungi- Metarhizium anisopliae andPaecilomyces fumosoroseus and Azadrachtin at single and combined releases against two spotted spider mite, Tetranychus urticae on sweet pea, Lathyrus odoratus crop during two consecutive seasons, 2016/2017 and 2017/2018 at Behera Governorate, Egypt. Highly reduction percentages in the population of T. urticae stages was stated with the combined treatment of Ph. persimilis +N. californicus,followed by Ph. persimilis + M. anisoplie and Ph. persimilis + P. fumosoroseus. The combined releasing of Ph. persimilis + O. albidipennis, and each of M. anisoplie, P. fumosoroseus, and Azadrachtin had the lowest effect of reducing T. urticae populations.
Highlights
Sweet pea, Lathyrus odoratus (Fabaceae) is an important vegetable crop that was cultivated in 43627.2 feddans and produced about 2505.384 tons/ feddan in Egypt (FAO report, 2017)
The objective of this study was carried out to evaluate the efficacy of eleven treatments, using three predators - Phytossulus persimilis, N. californicus and Orius albidipennis, and two fungi- Metarhizium anisopliae and Paecilomyces fumosoroseus and Azadirachtin 0.03% EC
Seasonal prevalence of T. urticae stages with different applied of biocontrol agents: Weekly fluctuation in the population of T. urticae stages during both tested seasons on sweet pea plants indicated that high numbers were reported at the pretreatment in all treatments (Figs. 1 & 2)
Summary
Lathyrus odoratus (Fabaceae) is an important vegetable crop that was cultivated in 43627.2 feddans and produced about 2505.384 tons/ feddan in Egypt (FAO report, 2017). L. odoratus is threatened by several mite pests, especially the two spotted spider mites, Tetranychus urticae Koch (Kamel et al 2018). T. urticae was a ubiquitous and economically important agricultural pest that attacked about 1200 species of plants and caused numerous damages on vegetable crops in Egypt (Abdallah, 2002). It was very rapid population growth rates (Clotuche, 2011) .The over-reliance on conventional acaricides in controlling spider mites led to hazardous to human, environment and domestic animals (Tirello et al, 2012). Chemical applications were the most common control strategy for T. urticae. It was acquired a highly T. urticae population resistance to acaricides (Tirello et al, 2012). Phytoseiulus presimilis AthiasHenriot (type I lifestyle) exclusively fed on tetranychus species, especially T. urticae (McMurtry and Croft, 1997 and Abou-Awad et al, 2017)
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