Insecticide practice for aphid control in potatoes

Abstract

Insecticide use for aphid control in potatoes by mainly Canterbury growers was assessed by a New Zealandwide postal survey in 200102 and by examination of spray diaries from Canterbury (11 seed and 13 process growers) in 200304 Only 22 (16 growers) of seed and 4 (12 growers) of fresh potato growers responded to the postal survey with Canterbury growers making up 93 of the respondents Overall results indicate that most seed crops received a single seed/tuber treatment as well as approximately five foliar applications Most process crops (200304 only) were seed/tuber treated with 0 or 1 foliar applications For fresh crops (200102 only) 59 were seed/tuber treated and 14 had 2 or 6 foliar applications Seed/tuber treatments were mostly imidacloprid but also phorate Foliar applications included organophosphate carbamate synthetic pyrethroid and pyridineazomethine insecticides Insecticide use patterns are discussed in relation to the effectiveness of aphid/virus control and the risk of insecticide resistance

Kiwifruit bacterial canker in Hayward kiwifruit Design of a quantitative questionnaire for kiwifruit growers

“…The response rate for the questionnaire was 26% (442 from 1669 eligible recipients). This rate of return is consistent with most kiwifruit industry questionnaires (M. Jopling, Zespri Ltd, personal communication) and also typical of New Zealand farmer response rates to epidemiology and on-farm hygiene questionnaires (Greer & Teulon 2003;Van Toor & Teulon 2006;Neumann et al 2013;Rosanowski et al 2013). Twelve respondents were excluded from further analysis either because they did not provide information about the disease status of the block (n=9) or other key information was missing (n=3).…”

Factors influencing the development of integrated pest management (IPM) in selected vegetable crops: A review

“…1999). additional research, funded by the MaF Sustainable Farming Fund, Vegfed, and the potato industry on aphid control in potatoes, aims to rationalise insecticide use and manage the development of insecticide resistance (van Toor & Teulon 2006).…”

“…In addition, the registration of insecticides with new modes of action (e.g., spinosad, pymetrozine, indoxacarb, imidacloprid, and thiachloprid) from 1998 to the present (aCVM 2004), and their promotion by the industry, has contributed significantly to further alterations in pesticide use patterns. The appearance of imidacloprid as a commercial seed treatment has reduced the use of organophosphates and carbamates in the potato industry (van Toor & Teulon 2006). although the use of this systemic material is considered to reduce impacts on some natural enemies (UCIPM 2002), its broad spectrum activity, possible impact on IPM programmes and environmental persistence have led to limitations on its use especially in north america (anon.…”