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1 March 2016 Longevity of Cleruchoides noackae (Hymenoptera: Mymaridae), an Egg Parasitoid of Thaumastocoris peregrinus (Hemiptera: Thaumastocoridae), with Various Honey Concentrations and at Several Temperatures
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Abstract

Thaumastocoris peregrinus Carpintero and Dellapé (Hemiptera: Thaumastocoridae), damages eucalyptus plants by sucking their sap. This pest can be controlled by releases of the egg parasitoid Cleruchoides noackae Lin and Huber (Hymenoptera: Mymaridae). Increasing the survival of this parasitoid is critically important for its mass rearing in order to release large numbers in integrated programs to manage T. peregrinus. The aim of this study was to evaluate the longevity of C. noackae adults fed various honey concentrations at 6 constant temperatures. The longevity of C. noackae was studied by keeping adults in a 1st experiment with 100, 50, or 10% honey solution, with distilled water, or without water and food in climate-controlled chambers at 25 ± 2 °C, 70 ± 10% RH, and a 12:12 h L:D photoperiod and—in a 2nd experiment—with 100% honey at constant temperatures of 15, 18, 21, 25, 28, or 31 °C in a climatic chamber at 70 ± 10% RH and a 12:12 h L:D photoperiod. Each adult parasitoid was held individually in a glass tube capped with plastic wrap under the conditions described, and the survival of adults was recorded daily. The longevity of C. noackae varied with food and temperature such that longevity was enhanced by all honey concentrations and temperatures of 25 °C and below. When fed honey, this parasitoid lived 2 to 3 fold longer when kept at 15, 18, 21, and 25 °C than at 28 and 31 °C. Thus, the parasitoid C. noackae should be mass reared with honey at temperatures from 15 to 25 °C for subsequent distribution of parasitoid adults in eucalyptus plantations for suppressing T. peregrinus.

Thaumastocoris peregrinus Carpintero and Dellapé (Hemiptera: Thaumastocoridae) is a pest of various Eucalyptus species and hybrids (Myrtales: Myrtaceae) in Argentina, Australia, Brazil, Chile, Kenya, South Africa, Uruguay, and Zimbabwe (Carpintero & Dellapé 2006; Nadel et al. 2010; Noack et al. 2011; Laudonia & Sasso 2012). The spread of T. peregrinus, outside its origin in the Southern Hemisphere, includes South Africa (Jacobs & Neser 2005; Nadel et al. 2010), Zimbabwe, Malawi, and Kenya (Noack et al. 2011). In South America, this pest has been detected in Argentina (Noack & Coviella 2006), Chile, Uruguay (Martínez & Bianchi 2010; Ide et al. 2011), and Brazil (Wilcken et al. 2010; Soliman et al. 2012). Furthermore, T. peregrinus was observed in Italy (Laudonia & Sasso 2012), Portugal (Garcia et al. 2013), and New Zealand (Sopow et al. 2012). Thaumastocoris peregrinus causes silvering, tanning, and drying of eucalyptus leaves. These symptoms result from the insect's feeding habits of piercing leaves and branches to suck sap, leading to chlorosis and reduction of tree growth and productivity (Soliman et al. 2012). Owing to the extension of plantations, the height of the eucalyptus trees, and the behavior of this insect pest, the efficiency of pesticide use in forest crops is reduced (Zanuncio et al. 2010).

Biological control is one of the strategies for the management of insect pests in forest plantations (Pereira et al. 2008; Garnas et al. 2012). The endoparasitoid Cleruchoides noackae Lin and Huber (Hymenoptera: Mymaridae), the main biological control agent of T. peregrinus (Nadel & Noack 2012), was found in the eggs of T. peregrinus on Eucalyptus scoparia Maiden in Australia (Lin et al. 2007; Nadel et al. 2012).

Successful introduction of a biological control agent such as C. noackae requires knowledge of its lifecycle and interactions with the host T. peregrinus (Mutitu et al. 2013). Programs of biological control with egg parasitoids depend on producing large numbers of these natural enemies in the mass rearing facilities and releasing them when this insect pest is present in the eucalyptus plantation (de Carvalho Spínola-Filho et al. 2014).

Mass rearing of C. noackae requires analysis of its feeding habits, because in nature, insects seek different nutritional sources such as sugars and other carbohydrates (Harvey et al. 2012) than in the laboratory, where they depend on the food provided. Generally, the feeding of parasitoids in the laboratory positively affects their longevity and fecundity as demonstrated for Aphytis melinus DeBach (Hymenoptera: Aphelinidae) (Heimpel et al. 1997), Cotesia glomerata (L.) (Hymenoptera: Braconidae) (Wäckers 2001), Pseudacteon tricuspis Borgmeier (Diptera: Phoridae) (Chen et al. 2005), and Diaeretiella rapae (McIntosh) (Hymenoptera: Braconidae) (Jamont et al. 2013). Consumption of food, especially sugars, provides energy to maintain metabolism, longevity, fecundity, and flight activity of insects (Tenhumberg et al. 2006; Winkler et al. 2009).

The complexity of the interaction between various factors can affect the success of classical biological control programs (Vorsino et al. 2012). Temperature is one of the most important abiotic factors affecting survival, behavior, distribution and colonization (Pratissoli et al. 2004, 2005; Colinet & Boivin 2011), duration of development and parasitism (Zago et al. 2007; Soares et al. 2012), reproduction and sex ratio (Frazer & McGregor 1992), and longevity (Burgi & Mills 2013) of natural enemies. Enhanced longevity of parasitoids allows them to search for longer periods and therefore increases the probability of parasitism (Evans et al. 2010; Vollhardt et al. 2010).

Suboptimal temperatures can negatively affect the biological characteristics of adult insects, which must be evaluated for parasitoids (Lessard & Boivin 2013). Low temperatures can cause physiological dysfunctions (Colinet & Boivin 2011), reduce fertility (Pandey & Johnson 2005), and decrease the parasitoid's mobility (Tezze & Botto 2004; Ayvaz et al. 2008). Thus, knowledge on development and longevity is important for maintaining and releasing the parasitoid C. noackae in integrated pest management programs against T. peregrinus. The objective of this study was to evaluate the longevity of C. noackae fed with several honey concentrations and reared at 6 constant temperatures.

Materials and Methods

The experiments were conducted in the laboratory of Biological Control of Forest Pests of the Faculty of Agricultural Sciences, São Paulo State University (UNESP) in Botucatu, São Paulo State, Brazil. Individuals of C. noackae were obtained from a rearing facility of Embrapa Forestry (Brazilian Agricultural Research Corporation) in Colombo, Parana State, Brazil, with T. peregrinus as the host. These parasitoids were obtained from T. peregrinus eggs originally collected in urban trees of Eucalyptus camaldulensis Dehnh. and E. scoparia in Sydney, New South Wales, Australia. The newly emerged adults of this parasitoid were held individually in glass tubes (8.5 cm high × 2.5 cm wide) capped with plastic film.

The longevity of C. noackae adults was evaluated in the following treatments: T1, 100% honey; T2, 50% honey; T3, 10% honey; T4, distilled water; and T5, without honey or water in chambers conditioned at 25 ± 2 °C, 70 ± 10% RH, and a 12:12 h L:D photoperiod. The honey concentrations were obtained by diluting the honey with distilled water. These foods were provided on paper towel every 24 h to C. noackae adults during the evaluation of their survival.

In the 2nd experiment, the longevity of C. noackae adults was evaluated at 15 °C (T1), 18 °C (T2), 21 °C (T3), 25 °C (T4), 28 °C (T5), and 31 °C (T6) in a climatic chamber at 70 ± 10% RH and a 12:12 h L:D photoperiod, and adults were fed 100% honey. The longevity of these parasitoids was determined every 24 h until all adults died.

The data of C. noackae longevity were subjected to the Shapiro—Wilk normality residues test and analysis of variance. The means were compared by using the nonparametric Kruskal—Wallis test.

Results

Cleruchoides noackae adults lived 3.4, 3.3, and 3.7 d (Table 1) when fed 100, 50, and 10% honey, respectively, and these 3 values were not significantly different. However, these longevities were significantly longer than those of adults fed only distilled water or nothing. The latter 2 longevities were 1.7 and 1.2 d, respectively, and they did not differ significantly from one another (Table 1).

At temperatures of 15, 18, and 25 °C, C. noackae adults showed the greatest longevities, which were 2.9, 3.3, and 3.5 d, respectively (Table 2). However, these 3 longevities did not differ significantly from the longevity of 2.2 d at 21 °C. At 28 and 31 °C, the longevities were 1.1 and 1.1 d, respectively, and these values were significantly shorter than those at 15, 18, and 25 °C, but not different from that at 21 °C (Table 2). The longevity of C. noackae adults was 2 to 3 fold greater at 15, 18, and 25 °C than at 28 and 31 °C.

Discussion

The increased longevity of C. noackae adults fed honey agrees with observations of other parasitoid species in the laboratory, such as Ibalia leucospoides (Hochenwarth) (Hymenoptera: Ibaliidae), in which longevity was increased by 10 d when adults were fed (Fischbein et al. 2013). Furthermore, Tachinaephagus zealandicus Ashmead (Hymenoptera: Encyrtidae) showed 2 to 3 fold greater longevity when fed honey and water than water alone (Almeida et al. 2002). The parasitoid D. rapae (Jamont et al. 2013) and the hyperparasitoid Gelis agilis (F.) (Hymenoptera: Ichneumonidae) (Harvey et al. 2012) also lived longer with honey than with sugar alone. This can be explained by the fact that honey is a highly concentrated solution of at least 181 substances such as sugars, proteins, enzymes, amino acids, minerals, and vitamins (Alvarez-Suarez et al. 2009).

Table 1.

Adult longevity of Cleruchoides noackae (Hymenoptera: Mymaridae) (mean ± SE and variation interval) with several concentrations of honey in chambers at 25 ± 2 °C, 70 ± 10% RH, and a 12:12 h L:D photoperiod (n = 10).

t01_33.gif

Table 2.

Adult longevity of Cleruchoides noackae (Hymenoptera: Mymaridae) (mean ± SE and variation interval) fed 100% honey at 6 constant temperatures in climatic chambers at 70 ± 10% RH and a 12:12 h L:D photoperiod (n = 10).

t02_33.gif

The benefits of feeding C. noackae with honey at 3 concentrations may not be a standard for parasitoids. Honey fed at 50% concentration increased the longevity of Apanteles metesae (Nixon) (Hymenoptera: Braconidae), but honey fed at higher concentrations decreased the longevity of this natural enemy (Salmah et al. 2012). This effect may be explained by honey, at low concentration, containing more water than carbohydrates, whereas high concentrations of honey contain more energy than water. Thus, excess energy or low water content can reduce the parasitoid's longevity (Salmah et al. 2012).

The shorter longevity of C. noackae without sugar is similar to that observed for A. melinus, whose females lived 30.5 d with honey and 17 d without food (Heimpel et al. 1997). Moreover, the longevity of A. metesae was longer when adults were fed 50% honey and 20% sucrose than when fed 50% sucrose or only distilled water (Salmah et al. 2012). Females of D. rapae showed greater longevity when fed with extrafloral nectar plus water, 20% honey, and honeydew plus water than those held without food (Jamont et al. 2013). These food sources may allow the acquisition of nutrients such as sugars, proteins, enzymes, amino acids, minerals, and vitamins from honey (Alvarez-Suarez et al. 2009) and sugars and lipids from the extrafloral nectar. Providing food to adult parasitoids is important because these natural enemies have only the energy accumulated during their immature stage, which may restrict longevity, fecundity, parasitism rate, ability to locate hosts, and flight (Lewis et al. 1998; Fadamiro & Heimpel 2001; Winkler et al. 2009).

Longevity of C. noackae in response to temperature was similar to that of Meteorus ictericus (Nees) (Hymenoptera: Braconidae) (Burgi & Mills 2013). The adaptation of the parasitoid to climatic conditions is important for its efficiency in biological control (Yu & Byers 1994). Temperature is one of the most important factors in acclimation of introduced parasitoids (Loni 1997), making it important to define the responses of these natural enemies to this factor (Ables et al. 1976).

Increased longevity of C. noackae at low temperature agrees with data for egg parasitoids such as Trissolcus simoni (Mayr) (Hymenoptera: Scelionidae) between 20 and 32 °C (Kivan & Kilic 2005) and Trichogramma pratissolii Querino & Zucchi (Hymenoptera: Trichogrammatidae) from 15 to 33 °C (Zago et al. 2007). Increased longevity may be associated with reduced activity and metabolism at lower temperatures (Gerling 1972; Bleicher & Parra 1990). Suboptimal temperatures can shorten the lifespan (Jalali & Singh 1992; Torres et al. 2002), reduce body size (Rundle et al. 2004) and energy reserves (Renault et al. 2003), increase the development period (Pratissoli et al. 2004), and reduce emergence and fecundity of parasitoids (Colinet & Boivin 2011). However, the intensity of the response varies with natural enemy species (Lessard & Boivin 2013); for example, the parasitoid Bracon vulgaris Ashmead (Hymenoptera: Braconidae) showed 2-fold greater longevity at 20 °C than that at 25 and 30 °C (Wanderley et al. 2007), and Trichospilus diatraeae Cherian & Margabandhu (Hymenoptera: Eulophidae) showed longevity of 34.4 and 1.5 d at 16 and 28 °C, respectively (Rodrigues et al. 2013).

The reduction in the longevity of C. noackae adults at higher temperatures is similar to that reported for the parasitoids Trichogramma pretiosum Riley and Trichogrammatoidea annulata De Santis (Hymenoptera: Trichogrammatidae) (Maceda et al. 2003), T. diatraeae (Rodrigues et al. 2013), and Palmistichus elaeisis Delvare & LaSalle (Hymenoptera: Eulophidae) (Pereira et al. 2011) between 10 and 31 °C. The lowest survival may have resulted from increased metabolic activity and destruction or denaturation of enzymes in the insects (Mohan et al. 1992). The low survival of C. noackae at high temperatures indicates that this parasitoid has few possibilities of field adaptation to warm temperatures. Therefore, one option for its use in management programs should be to release large numbers of C. noackae adults in these warm regions.

The parasitoid C. noackae showed greatest longevity when fed with honey at concentrations of 100, 50, and 10% and reared at 15 and 18 °C. The provision of food at appropriate temperature is important for the production of C. noackae in the laboratory. The findings of this study can help in defining strategies for the rearing to release this parasitoid in biological control programs against T. peregrinus.

Acknowledgments

We thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), and the Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) for financial support. Global Edico Services corrected and edited the English of the submitted manuscript.

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Amanda Rodrigues de Souza, Murici Carlos Candelaria, Leonardo Rodrigues Barbosa, Carlos Frederico Wilcken, Juliana M. Campos, José Eduardo Serrão, and José Cola Zanuncio "Longevity of Cleruchoides noackae (Hymenoptera: Mymaridae), an Egg Parasitoid of Thaumastocoris peregrinus (Hemiptera: Thaumastocoridae), with Various Honey Concentrations and at Several Temperatures," Florida Entomologist 99(1), 33-37, (1 March 2016). https://doi.org/10.1653/024.099.0107
Published: 1 March 2016
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