Pigeonpea (Cajanus cajan L.) is an annually cultivated food and forage crop, attacked by a large number of pests mainly pod borer (Helicoverpa armigera). For the control of this insect pest, a combination of broad-spectrum insecticides viz., chlorantraniliprole and λ-cyhalothrin have been in use to reduce the pod damage and increase crop production worldwide. Therefore, a field trial was conducted to study dissipation and persistence behavior of insecticides combination (Chlorantraniliprole 9.26 % + λ-cyhalothrin 4.63 % ZC) in/on pigeonpea at the recommended dose (RD) 30 g a.i./ha and double recommended dose 60 g a.i./ha (2RD). The quantitative analysis was performed using ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) for chlorantraniliprole and Gas chromatography with electron captured detector (GC-ECD) for λ-cyhalothrin. The Quick, Easy, Cheap, Effective, Rugged and Safe (QuEChERS) method was validated for its accuracy, precision and sensitivity. The chlorantraniliprole persisted upto 30 days and λ-cyhalothrin persisted upto 10 days at RD and 20 days at 2RD. The half-lives (DT₅₀) of chlorantraniliprole and λ-cyhalothrin were from 4.95 to 5.78 days and 2.48–4.33 days at recommended and double recommended dose in pigeonpea, respectively. However, residues of both insecticides measured from soil at 30^th day and harvest time were below the limit of quantification (LOQ). The waiting period deciphered for chlorantraniliprole and λ-cyhalothrin applied as combi-product was 9 days at recommended dose. Dietary risk assessment (Risk quotient<1) was performed on the basis of field trial suggested the application of chlorantraniliprole and λ-cyhalothrin as combi-product at recommended dose is safe for the consumers.

木豆（Cajanus cajan L.）是一种每年种植的粮食和饲料作物，主要受荚虫（Helicoverpa armigera）的害虫侵袭。为了控制这种害虫，使用了广谱杀虫剂的组合，即氯蒽醌和λ-氯氟氰菊酯已被用于减少豆荚的损害并提高全世界的农作物产量。因此，进行了一项田间试验，研究了在推荐剂量（RD）30 g ai / ha和两倍推荐剂量60 g的木豆中/上使用杀虫剂组合（氯吡虫啉9.26％+λ-氯氟氰菊酯4.63％ZC）的消散和持久性行为。 ai / ha（2RD）。定量分析是使用超高效液相色谱串联质谱法（UHPLC-MS / MS）进行氯氰菊酯的分析和气相色谱用电子捕获检测器（GC-ECD）进行的氯氟氰菊酯的分析。快速，简便，便宜，有效，坚固和安全（QuEChERS）方法经过验证，具有准确性，精密度和灵敏性的特点。氯氰菊酯在RD持续30天，而氟氰菊酯在RD持续10天，在2RD持续20天。半衰期（DT₅₀氯虫苯甲酰胺和λ三氯氟氰菊酯）分别为从4.95到5.78天和2.48-4.33天在推荐和双推荐剂量在木豆，。但是，在^第30天和收获时间从土壤中测得的两种杀虫剂的残留量均低于定量限（LOQ）。推荐的剂量下，氯尿嘧啶和λ-氯氟氰菊酯作为组合产品应用的等待时间为9天。饮食风险评估（风险商<1）是在田间试验的基础上进行的，表明以建议的剂量联合使用扑虫腈和λ-氯氟氰菊酯作为推荐产品对消费者而言是安全的。