Control of the Mexican bean weevil Zabrotes subfasciatus with kaolin/Controle do caruncho-do-feijao Zabrotes subfasciatus com caulim.
The weevil Zabrotes subfasciatus (Boheman, 1833) (Coleoptera: Crysomelidae: Bruchinae) is an important pest of beans (Phaseolus vulgaris L.). This insect damages the stored legume seeds in tropical regions (SPERANDIO, 2001). Larvae develop in the cotyledons until reach adult stage, causing reduction of weight, nutritional quality (CREDLAND & DENDY, 1992; GALLO et al., 2002), germination and vigor (HOHMANN & CARVALHO, 1989) and also contributing to the development of fungi and mycotoxins in the grains. The quality of seeds is also reduced. Plants from seeds with one hole of Z. subfasciatus presented a reduced number of seeds, weight of 100 seeds and yield; plants from seeds with four holes presented 3 and 2.5 times less germination and weight of 100 seeds, respectively, in comparison with the control (CHIPUNGAHELO et al., 2001).
Inert dust and botanical extracts have been studied as substitutes to chemical insecticides due to insect resistance, increasing costs and suitability for small farmer conditions (GARCIA et al., 2000; ALMEIDA et al., 2005). Neem plant (Azadirachta indica A. Juss) derivatives are referred as effective to more than 300 species of insects (SCHMUTTERER, 1990). OLIVEIRA & VENDRAMIM (1999) found that the neem oil repelled Z. subfasciatus weevils from beans. BARBOSA et al. (2002) obtained protection during 150 days using 3mL of neem oil [kg.sup.-1] of beans seed.
Diatomaceous earth (DE) also has been used to control insects in stored grains. This material acts physically on insects, destroying the cuticle by abrasion and absorbing lipids, causing insect death by desiccation (GOLOB, 1997). DE is the fossilized sediments of microscopic diatomaceous algae mainly composed of hydrated silica in the shape of disordered crystals (PINTO JUNIOR et al., 2005) and may be associated with insecticides (BARROS, 1999; CERUTI & LAZZARI, 2005); has no toxic effect for humans or animals (ATUI et al., 2003). LAZZARI (2005) obtained satisfactory control of Z. subfasciatus using diatomaceous earth (0.75 and 1.00g [kg.sup.-1] of beans) at different temperatures (15, 20, 27 e 30[degrees]C).
Kaolin is an aluminum silicate, nonabrasive dust that when activated by acid and heat treatments has a high specific surface that absorbs the wax in the epicuticle of insect pests of stored grains (EBELING, 1971). In addition, it has been referred as effective in the control of some plant pests such as aphids (COTTRELL et al., 2002), olive fruit flies (SAOUR & MAKEE, 2004) and pear psyllids (GLENN et al., 1999). Thus, the efficiency of kaolin (with or without neem oil), compared with diatomaceous earth, on Z. subfasciatus in common beans was studied in laboratory.
MATERIAL AND METHODS
Experiments were conducted in the Entomology Laboratory, Department of Agronomy, Universidade Estadual de Londrina, Londrina, PR, Brazil. A rearing facility of Z. subfasciatus was maintained in the laboratory. Common bean cv. Carioca was used both in rearing and experiments. Treatments were kaolin (Protesyl[R]) (Fertirico, Curitiba, PR, Brazil) (2, 4 and 8g [kg.sup.-1]), kaolin+neem [2g [kg.sup.-1] (5% neem oil)] (Fertirico, Curitiba, PR, Brazil); diatomaceous earth (DE) (KeepDry[R]) (Vet Quimica, Campinas, SP, Brazil) (1g [kg.sup.-1]) and control. The dusts were placed in plastic bags containing the grains and mixed during two minutes. The grains (30g) were put in 100mL vials containing five holes of 0.5mm in the cover. Five couples of Z. subfasciatus beetles were placed in each vial. Vials were maintained in environmental chambers (T 25 [+ or -] 2[degrees]C; RH 70 [+ or -] 10%; 12h Photophase).
Weevils' mortality was evaluated daily. Insects were considered dead when no movements were observed after be touched by a brush. After the assessment, died insects were recorded, sexed and discarded, and the alive insects were replaced in the vial. Eight days after experiment onset, all adults were removed and eggs quantified. The vials remained in the environmental chamber until total emergency of the F1 generation.
The completely randomized design was used. Proportion data (mortality) were transformed using arc sen (square root sen/100). ANOVA was performed on data and means compared using Tukey's test (P<0.05).
RESULTS AND DISCUSSION
In general, from second day after treatment, higher mortalities were found in the treatment with DE in which total mortality was observed in the third day for females and fourth day for males (Tables 1, 2). On the other hand, in the treatment using kaolin, 100% of mortality was observed in the fourth (4 and 8g [kg.sup.-1]) and seventh (2g [kg.sup.-1]) days for females; and 100 and 96% of mortality was found in the sixth (2g [kg.sup.-1]) and eight (4 and 8g [kg.sup.-1]) days for males, respectively. Higher doses of kaolin did not improve significantly the mortality.
In the treatment in which kaolin was mixed with neem oil, the efficiency was lower in the first assessments. Mortality was similar to the other treatments using kaolin just in the seventh and eight days for females and males, respectively (Table 1, 2). These results corroborate previous information about the relatively fast time of action of DE. Total mortality of Acanthoscelides obtectus (Coleoptera: Bruchinae) in common bean grains was referred at three and four days after treatment in the same dosage used in the present study (PINTO JUNIOR et al., 2005; BAVARESCO, 2007).
The higher number of eggs in the grains was found on the control treatment (Table 3). In the treatment with kaolin + neem, values were intermediate. The lowest number of eggs was found in the higher doses of kaolin. Except for the control, females deposited eggs in the vials walls.
Higher number of emerged adults was observed in the control. In the kaolin + neem treatment values were intermediate (Table 3). DE and mostly kaolin probably changed the oviposition behavior because females placed their eggs in the walls of the vials. This behavior probably disabled larvae survival because when larvae hatch, they penetrate directly inside the grains without contact with the outside [CARVALHO & ROSSETTO (1968) apud SPERANDIO (2001)]. Activated kaolin was also used for paddy rice treatment and suppressed progeny of some insect species for 250 days (PERMUAL & PATOUREAL, 1992). Insecticidal proprieties of DE and activated kaolin are attributed mostly by the thin dust proprieties that absorbs the lipids of the insect cuticle what promotes its desiccation (EBELINQ 1971; GOLOB, 1997). Although the kaolin formulation used in this study was not heat or acid activated, protection of the grains was found. Another probable explanation for this efficiency is the physical action of the dusts on the surface of the grains affecting beetles behavior. According to HEADLEE (1924), when beans are treated with some kinds of inert dusts, larvae slips have no adherence to on the grain surface and difficulties to drill into the bean. Kaolin (hydrated aluminum silicate) formulation, when applied to the plants, constitutes a protective barrier (Particle Film Technology) that acts by repellence or physical barrier which difficult movements, feeding and oviposition (GLENN & PUTERKA, 2005). The results obtained in this study confirm for a pest of stored grains the previous results in which kaolin formulation reduced insect infestations in cultivated plants (EL-WAKEIL & SALEH, 2007; COTTRELL et al., 2002). Apparently, the protective barrier was effective because, when bean grains were treated with kaolin, the majority of eggs were placed in the vials walls (Table 3).
Other inert dusts also have been proposed for the common bean beetles management. However, hydrated lime and mostly dolomitic lime and wood ash are used in higher concentration than the present study (6; 200 and 200g [kg.sup.-1], respectively) (BAVARESCO, 2007).
Although neem oil is reported as effective against Z. subfasciatus (BARBOSA et al., 2002; SILVA et al., 2007), antagonistic effects probably occurred when it was mixed with kaolin (Tables 1, 2 and 3). The oil may have affected the sorptive effect and the physical characteristics of kaolin and the protective layer would be negatively influenced. Further investigations using other neem derivatives (extracts or powders) can be conducted to test this hypothesis.
Kaolin treatment constitutes a suitable candidate for Z. subfasciatus management because the F1 generation been similar to DE although higher periods and doses than DE is necessary to promote high mortality. The mixture of kaolin and neem oil is not efficient in the control of Z. subfasciatus.
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Adriana Yatie Mikami (I) Aline PissinatiI Dafila Fagotti (I) Ayres de Oliveira Menezes Junior (II) Mauricio Ursi Ventura (II) *
(I) Pograma de Pos-graduacao em Agronomia, Centro de Ciencias Agrarias, Universidade Estadual de Londrina (UEL), Londrina, PR, Brasil.
(II) Departamento de Agronomia, UEL, CP 6001, 86051-970, Londrina PR, Brasil. E- mail: email@example.com. Autor para correspondencia.
Received 03.06.09 Approved 05.10.10 Returned by the author 06.29.10 CR-17
Table 1--Cumulative mortality(%) of Zabrotes subfasciatus females in common beans grains treated with kaolin, kaolin + neem and diatomaceous earth in the laboratory (25 [+ or -] 2[degrees]C, 70% RH; 12: 2 L: D). Cumulative mortality (1) (Days after treatment) Treatments 1 2 3 4 Kaolin (2g [kg.sup.-1]) 16 C ab 28 C bc 64 B bc 84 AB a Kaolin (4g [kg.sup.-1]) 8 C ab 44 B bc 84 A ab 100 A a Kaolin (8g [kg.sup.-1]) 36 B a 76 A a 92 A a 100 A a Kaolin + neem 4 E b 8 DE c 40 CD cd 48 BC b [2g [kg.sup.-1] (5% neem oil)] Diatomaceous earth 24 C ab 76 B a 100 A a 100 A a (1g [kg.sup.-1]) Control 4 C b 16BC bc 24 BC d 28 BC b Cumulative mortality (1) (Days after treatment) Treatments 5 6 7 8 Kaolin (2g [kg.sup.-1]) 92 A a 96 A ab 100 A a 100 A a Kaolin (4g [kg.sup.-1]) 100 A a 100 A a 100 A a 100 A a Kaolin (8g [kg.sup.-1]) 100 A a 100 A a 100 A a 100 A a Kaolin + neem 64 ABC b 76 AB b 84 A b 92 A a [2g [kg.sup.-1] (5% neem oil)] Diatomaceous earth 100 A a 100 A a 100 A a 100 A a (1g [kg.sup.-1]) Control 36 AB c 40 AB c 56 A c 56 A b (1) Means followed by the same letter did not differ using Tukey's test (P<0.05) (capital letters in the lines and lower case in the columns). Table 2--Cumulative mortality (%) of Zabrotes subfasciatus weevils males in common bean grains treated with kaolin, kaolin + neem and diatomaceous earth in the laboratory (25 [+ or -] 2[degrees]C, 70% RH; 12: 2 L: D). Cumulative mortality (1) (Days after treatment) Treatments 1 2 3 4 Kaolin (2g [kg.sup.-1]) 8 D a 32 CD bc 56 BC b 84 AB a Kaolin (4g [kg.sup.-1]) 4 D a 40 C bc 72 B ab 92 AB a Kaolin (8g [kg.sup.-1]) 0 C a 52 B ab 92 A a 96 A a Kaolin + neem 4 D a 12 D bc 24 CD c 48 BC b [2g [kg.sup.-1] (5% neem oil)] Diatomaceous earth 24 B a 84 A a 96 A a 100 A a (1g [kg.sup.-1]) Control 4 A a 4 A c 4 A c 8 A c Cumulative mortality (1) (Days after treatment) Treatments 5 6 7 8 Kaolin (2g [kg.sup.-1]) 96 A a 100 A a 100 A a 100 A a Kaolin (4g [kg.sup.-1]) 92 AB ab 92 AB a 92 AB a 96 A a Kaolin (8g [kg.sup.-1]) 96 A a 96 A a 96 A a 96 A a Kaolin + neem 68 AB b 80 A a 96 A a 96 A a [2g [kg.sup.-1] (5% neem oil)] Diatomaceous earth 100 A a 100 A a 100 A a 100 A a (1g [kg.sup.-1]) Control 16 A c 20 A b 32 A b 40 A b (1) Means followed by the same letter did not differ using Tukey's test (P<0.05) (capital letters in the lines and lower case in the columns). Table 3--Means number of eggs ([+ or -] SE) and emerged beetles of Zabrotes subfasciatus in common beans grains treated with kaolin, kaolin + neem and diatomaceous earth in laboratory (25 [+ or -] 2[degrees]C, 70% RH; 12: 2 L: D). Number of eggs (1) Treatments Grains Vials Kaolin (2g [kg.sup.-1]) 10.4 [+ or -] 2.4 bc 14.4 [+ or -] 4.4 a Kaolin (4g [kg.sup.-1]) 8.8 [+ or -] 1.7 bc 11.4 [+ or -] 2.4 a Kaolin (8g [kg.sup.-1]) 0.8 [+ or -] 0.8 c 10 [+ or -] 6.5 a Kaolin + neem 26 [+ or -] 4.1 b 8.6 [+ or -] 4.1 a [2g [kg.sup.-1] (5% neem oil)] Diatomaceous earth 7.8 [+ or -] 2.7 bc 1.6 [+ or -] 0.5 a Control 64.2 [+ or -] 9.8 a 0 [+ or -] 0.0 a Number of eggs (1) Emerged adults (1) Treatments Total Females Kaolin (2g [kg.sup.-1]) 24.8 [+ or -] 5.4 b 3.6 [+ or -] 0.9 bc Kaolin (4g [kg.sup.-1]) 20.2 [+ or -] 2.6 b 2.8 [+ or -] 1.0 bc Kaolin (8g [kg.sup.-1]) 10.2 [+ or -] 6.4 b 0.4 [+ or -] 0.2 c Kaolin + neem 34.6 [+ or -] 6.4 b 9.8 [+ or -] 1.5 ab [2g [kg.sup.-1] (5% neem oil)] Diatomaceous earth 9.4 [+ or -] 2.8 b 4.4 [+ or -] 1.8 bc Control 64.2 [+ or -] 9.8 b 15.4 [+ or -] 3.8 a Emerged adults (1) Treatments Males Total Kaolin (2g [kg.sup.-1]) 3.8 [+ or -] 1.4 b 7.4 [+ or -] 1.9 b Kaolin (4g [kg.sup.-1]) 3.4 [+ or -] 1.1 b 6.2 [+ or -] 1.6 b Kaolin (8g [kg.sup.-1]) 0.4 [+ or -] 0.2 b 0.8 [+ or -] 0.4 b Kaolin + neem 11 [+ or -] 1.3 a 20.8 [+ or -] 2.2 a [2g [kg.sup.-1] (5% neem oil)] Diatomaceous earth 2.4 [+ or -] 0.9 b 6.8 [+ or -] 2.6 b Control 16.8 [+ or -] 3.0 a 32.2 [+ or -] 6.2 a (1) Means followed by the same letter did not differ using Tukey's test (P<0.05) (capital letters in the lines and lower case in the columns).