Abstract
Resistance ratio (RR) and biochemical alterations for seven bioinsecticides against Spodoptera littoralisin two Egyptian governorates were assayed. The values of LC50 have fluctuated from 42.9 to 0.01 ppm for the strain of Menofia governorate, but in Gharbia governorate the values have fluctuated from 0.004 to 0.1 ppm. On the other hand, RR for the examined insecticides: Radeiant®, Agrine®, DipelDF®, Dipel 2X®, Brotecto®, Radecal® and Biotect® during 2019 cotton season. Resistance ratio (RR) for seven insect growth regulators (IGR's) Demelen®, Tobron®, Demeron®, Kabres®, Kalegron® and Match® against S. littoralis were also assayed. LC50 values in Menofia governorate have fluctuated from 0.014 to 2.9 ppm, and RR values were very low. Finally these compounds still effective against S. littoralis during 2019 season. Alterations were induced in enzymes: acetylcholinesterase (AChE), glutathione-S- transferase (GST), acid and alkaline phosphatase as well as total protein, to field strains, with respect to laboratory strains. From all findings, the coupling of LC50, RR values and-related enzymes may recognize a reliable tool to assess S. littoralis resistance. Moreover, bioinsecticides and IGR.s were very effective to control leafworm in cotton fields.
Highlights
The cotton leafworm Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) is a polyphagous insect pest
The study was designed to assess resistance monitoring of some bioinsecticides and insect growth regulators (IGR's) in cotton 2019 season for S. littoralis in two governorates and evaluated some biochemical alterations attributing to resistance action
Resistance ratio (RR) value was very low the value did not appear any resistance in the tow strains for bio-insecticides: Radeiant®, Agrien®, DipelDF®, Dipel 2X®, Brotecto®, Radecal®, and Biotect®, respectively
Summary
The cotton leafworm Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) is a polyphagous insect pest. The study was designed to assess resistance monitoring of some bioinsecticides and IGR's in cotton 2019 season for S. littoralis in two governorates and evaluated some biochemical alterations attributing to resistance action. RR values were as follows: Agrien® (1.12 and 3.61) Dipel2X® (0.66 and 2.84), DipelDF® (235 and 3.28), Brotecto® (0.12 and 0.83), Radical® (0.63 and 12.9) and Biotect® (0.21 and 0.12), respectively, for Menofia and Gharbia samples.
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