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Comparative Efficacy of Classical and Biorational Insecticides on Sugar Beet Weevil, Bothynoderes Punctiventris Germar (Coleoptera: Curculionidae)

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Comparative Efficacy of Classical and Biorational Insecticides on Sugar Beet Weevil, Bothynoderes Punctiventris Germar (Coleoptera: Curculionidae) Vol. 52, 2016, No. 2: 134–141 Plant Protect. Sci. doi: 10.17221/86/2015-PPS Comparative Efficacy of Classical and Biorational Insecticides on Sugar Beet Weevil, Bothynoderes punctiventris Germar (Coleoptera: Curculionidae) Renata BAžoK, Mihaela ŠATVAR, Ivan RADOŠ, Zrinka Drmić, Darija LEMIć, Maja ČAčiJA and Helena Virić GAŠPArić Department of Agricultural Zoology, Faculty of Agriculture, University of Zagreb, Zagreb, Croatia Abstract Bažok R., Šatvar M., Radoš I., Drmić Z., Lemić D., Čačija M., Virić Gašparić H. (2016): Comparative efficacy of classical and biorational insecticides on sugar beet weevil, Bothynoderes punctiventris Germar (Coleoptera: Curculionidae). Plant Protect. Sci., 52: 134–141. The contact and ingestion activity and the potential of the insecticide spinosad for the control of sugar beet weevil were evaluated and compared with commercially used insecticides lambda-cyhalothrin and chlorpyriphos + cyper- methrin. Results of three laboratory trials proved very good efficacy of spinosad applied at the dose of 72 g a.i./ha. Its efficacy was similar to chlorpyriphos + cypermethrin and significantly higher than that of lambda-cyhalothrin. Due to its favourable eco-toxicological properties and good ingestion activity, spinosad is a good candidate to be introduced in the integrated pest management strategy against beet weevil. Keywords: Bothynoderes punctiventris; biorational insecticides; contact activity; ingestion activity; spinosad; sugar beet Sugar beet (Beta vulgaris var. saccharifera Alef.) ligustici L.) and maize leaf weevil (Tanymechus di- cultivation in Croatia has increased from 21 000 to laticollis Gyll.). The first mass attack of sugar beet 27 000 ha in the past five years (Statistical Yearbook weevil in Croatia was recorded in Osijek, Vukovar of Republic of Croatia 2012). In Croatia, sugar beet and Vinkovci in 1922 (Kovacevic 1929), and a high has been sown since 1905. It is a profitable but highly occurrence of pests was recorded from 1925 to 1931. demanded field crop (Pospišil 2010). Sugar beet From 1965 through the early 2000s, the beet weevil plants are the most sensitive to pests at early emer- was an important pest in the Vojvodina region but gence stage and when developing the first 3–4 pairs not in Croatia. In eastern Croatia, the population of of leaves. If we prevent damage by any kind of pests the pests was below the economic threshold until in this period, we would ensure significantly higher 2008 (Bažok et al. 2012). In the last seven years the yield and sugar content compared to fields in which sugar beet weevil population has been regularly very the damage has not been prevented (Čamprag 1973; high causing serious damage. One cause is global Bažok 2010; Pospišil 2010). Adult weevils are chew- climate change, high temperatures, which have also ing sugar beet plants in early spring and may cause been suggested for Ukraine by Fedorenko (2006) the complete destruction of plants. Čamprag (1973) and for Vojvodina (Vuković et al. 2014). Bažok listed 47 species of weevils attacking sugar beet et al. (2012) concluded that besides the changes in plants. However, the most harmful are sugar beet climatic conditions, the high population density of weevil (Bothynoderes punctiventris Germar, 1824), weevils is a result of the change in the pest control black sugar beet weevil (Psallidium maxillosum practices. Compared to insecticides used in the 1980s, [F.]), alfalfa snout beetle (or weevil) (Otiorhynchus new insecticides used for the control of soil pests and Supported by the Croatian Science Foundation, Grants No. 09/23 and IPA and No. 2007/HR/16IPO/001-040511. 134 Plant Protect. Sci. Vol. 52, 2016, No. 2: 134–141 doi: 10.17221/86/2015-PPS for the control of flea beetle have very weak side ef- low toxicity to mammals and fish, and it has been fects on sugar beet weevils. Additionally, an increase reported to exert relatively minimal effects on ben- in the cultivation area of sugar beet contributes to eficial insects (Cleveland et al. 2002; Thomas & creating the preconditions for sugar beet weevil Mangam 2005; Ruiz et al. 2008; Mangan & Moreno becoming the most important pest of sugar beet, as 2009; Urbaneja et al. 2009). This makes it suitable it is the case in neighbouring countries (Čamprag for application in urban areas and integrated pest 1983; Vuković et al. 2014). management programs (Cleveland 2007). Pest control is mainly based on the use of insecti- Thus, the objective of the study was to evaluate cides (Sekulić et al. 1997). Chlorinated hydrocarbons the contact and digestive toxicity of the insecticide (Čamprag 1986), organic phosphorus (OP) insecti- spinosad on sugar beet weevil and to evaluate its cides (Radin 1983), and pyrethroids (P) in combination potential for the control of this pest in comparison with organophosphorus insecticides (Bažok et al. with currently used insecticides. 2012) have been used with varying degrees of success. Due to the implementation of EU pesticide legislation, a number of active ingredients allowed for the sugar MATERIAL AND METHODS beet weevil control in Croatia has been reduced in the last ten years. Currently, three insecticides based Laboratory trials were set up in 2014 and 2015 with on four active ingredients are allowed for the sugar weevils collected in old sugar beet fields in the vicin- beet weevil control: lambda-cyhalothrin (Karate Zeon, ity of Tovarnik (east Croatia, latitude 45°11'33.5''N, Syngenta), combination of chlorpyriphos and cyper- longitude 19°07'21.2''E and altitude 89 m a.s.l.). Col- methrin (Chromorel D, Agriphar), and acetamiprid lected adults were kept in entomological cages for (Mospilan, Nippon) (Bažok 2015). Allowed active five days until they were used in the test, without ingredients belong to the group of OP insecticides additional feeding during storage and without previ- (chlorpyriphos), pyrethroids (lambda-cyhalothrin ous contact with insecticides. Sugar beet plants were and cypermethrin), and neonicotinoids (acetamiprid). grown in a laboratory from untreated seeds of the There is an intention in the European Union to limit Artus variety (Strube International). the use of all these insecticides in the future. Application of insecticides. In three experiments Due to the specific morphological structure of (two in 2014 and one in 2015) the contact, diges- weevils, their large feeding capacity and the small tive, and combined efficacy of three insecticides leaf area of plants at the time of insecticide applica- was compared. Widely used pyrethroid insecticides tion, even allowed insecticides often give very poor (lambda-cyhalothrin, Karate Zeon, Syngenta) and results and require repeated treatment (Bažok et al. combination of pyrethroid and organophospho- 2012), which is not in accordance with the principles rus insecticides (chlorpyriphos and cypermethrin, of Integrated Pest Management (IPM) nor with the Chromorel D, Agriphar) were compared with the rational use of pesticides in modern agriculture. biorational insecticide spinosad (Laser 240 SC). Spinosad is a novel mode-of-action selective biologi- Investigated insecticides and doses are shown in cal insecticide (Saunders & Bret 1997) with proved Table 1. Each insecticide was evaluated for contact, efficacy for controlling a wide range of pests includ- digestive, and combined action separately. ing Lepidoptera, Diptera, Thysanoptera, Coleoptera, Plastic cups (Ø 11 cm, 500 ml in volume) were dipped Orthoptera, and Hymenoptera (Sparks et al. 1995). in insecticide solutions in order to achieve contact This pesticide is obtained from the soil-borne bacte- action. After the treatment, cups were let to dry. ria, Saccharopolyspora spinosa (Mertz & Yao 1990), Treated cups were used for the treatment in which by fermentation and contains two active spinosoids: contact and combined action was investigated. Sugar spinosyn A and spinosyn D (at an approximate ratio beet plants were dipped in the insecticide solutions of 17 : 3) (Mertz & Yao 1990). Spinosad exerts its as described by the modified IRAC No 7 (Frac/Irac toxic effects on insects by affecting their nicotinic Newsletter, No 5, 1990) method for the treatment in acetylcholine (nAChRs) and gamma-aminobutyric which digestive and combined action was investigated. acid (GABA) receptors (Salgado 1997) and also Contact action was evaluated by applying insec- inhibits acetylcholinesterase (Rabea et al. 2010). It ticides to the plastic cups in which weevils were set has been used for the control of various agricultural up without plants. For the untreated control weevils and veterinary pests in many countries. Spinosad has were placed into plastic cups treated with water and 135 Vol. 52, 2016, No. 2: 134–141 Plant Protect. Sci. doi: 10.17221/86/2015-PPS Table 1. Insecticide treatments used in trials Dose applied Action Trial (year) Treatment (g a.i./ha) investigated No. 1 (2014) No. 2 (2014) No. 3 (2015) digestive + Spinosad 36 contact + combined + digestive + Spinosad 96 contact + combined + digestive + + Lambdacychalo- 7.5 contact + + thrin combined + + digestive + Chlorpyriphos + 1000 + 100 contact + cypermethrin combined + without food + + + Untreated with food + + + without plants. Digestive action was evaluated by plac- Results were analysed by analysis of variance pro- ® ing weevils into untreated plastic cups in which treated cedures using the ARM 9 software (Gylling Data sugar beet plants were placed. Combined action was Management 2014) with means separation estimated evaluated by placing weevils into treated plastic
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