Effectiveness of imidacloprid in combination with a root nitrogen fertilizer applied to tomato seedlings against Bemisia tabaci (Hemiptera: Aleyrodidae). (February 2016)

• Record Type: Journal Article
• Authors: Sun, Yuan-Xing; Liu, Tong-Xian
• Is Part Of: Crop protection. Volume 80(2016)
• Page Start: 56
• Page End: 64
• Publication Date: 2016-02
• Subjects: Imidacloprid -- Fertilizer -- Irrigation -- Seedlings -- Bemisia tabaci; Plants, Protection of -- Periodicals; 632.05
• DOI: 10.1016/j.cropro.2015.10.025
• Languages: English
• ISSNs: 0261-2194

Abstract

Abstract: The whitefly Bemisia tabaci (biotype B) is a worldwide pest of vegetables and field crops. We tested the efficacy of imidacloprid (IM) with a root fertilizer 'Root Feed (RF)' (9% N, 7% Ca, 1.5% Mg and 0.1% B) sub-irrigated in the growing medium against the whitefly on tomato. Tomato seedlings (3–4 true leaves) were treated with 0, 3, 6 or 12 mg active ingredient (a.i.) seedling −1 of IM and with RF (0, 0.02, 0.04 or 0.08 ml seedling −1 ). The efficacy of 12 mg IM seedling −1 was further evaluated in the greenhouse for 60 days. The survival of B. tabaci adults, nymphs, and egg production were negatively affected by the treatments in a dosage-dependent manner. Treatment of 12 mg IM seedling −1 caused >60% adult and nymph mortality 50 days after treatment (DAT). The active ingredient of IM in tomato leaves also increased with the increase of IM dosage. The RF exhibited a limited effect on B. tabaci . However, the mortality of whitefly adults and nymphs treated with RF (0.02 or 0.04 ml seedling −1 ) positively interacted with IM, and was greater than IM alone. In the greenhouse, 12 mg IM seedling −1 greatly reduced the number of whitefly adults and increased the dry weight of the tomato plants at 30 DAT. In conclusion, application of 12 mg IM seedling −1 on tomato seedlings before transplanting effectively controled B. tabaci for up to 50 days, and the efficacy of IM combined with 0.02 ml RF seedling −1 performed even better. This could be a cost-effective method for managing B. tabaci on tomato and other vegetables. Highlights: Sub-irrigation of imidacloprid in combination with a root fertilizer Root Feed to tomato at the seeding stage is cost-effective for managing Bemisia tabaci . The effectiveness of 12 ml seeding −1 imidacloprid against B. tabaci lasted up to 50 days. 0.02 or 0.04 ml seeding −1 Root Feed positively interacted with imidacloprid after treatment. In greenhouse, 12 ml seedling −1 imidacloprid alone or combined with the fertilizer was effective against B. tabaci .