New Potential Potato Pest in Argentina, Maecolaspis bridarollii (Bechyné) (Coleoptera, Chrysomelidae, Eumolpinae)

En muestreos realizados en cultivos de papa en el sudeste de la provincia de Buenos Aires (Argentina), se registro la presencia de un crisomelido eumolpino del genero Maecolaspis (Bechyne) que ocasionaba severos danos en los tuberculos. Los objetivos de este trabajo fueron: identificar al adulto, aportar datos sobre su bionomia y caracteristicas del dano que produce. Como resultado se cita por primera vez a Maecolaspis bridarollii (Bechyne) en este cultivo; se redescribe y se aportan nuevos caracteres discriminatorios. Se observo que, a partir de mediados de marzo, las larvas que alcanzaron un mayor desarrollo, danan los tuberculos, haciendoles perforaciones profundas que desmejoran su calidad comercial.A chrysomelid of the genus Maecolaspis (Bechyné) was identified as the damaging agent to potato crops in samples obtained from the southeast of Buenos Aires Province (Argentina). The objectives of this research were to identify the adult insect and produce information on its bionomics and on the characteristics of the damage it causes. For the first time Maecolaspis bridarollii (Bechyné) is reported affecting potatoes. According to results, the best harvesting time to reduce damage was immediately after the potato crop completed its growth cycle, henee limiting exposure to the attack of mature M. bridarollii larvae on potato tubers. From mid-March the larvae that had reached full development bored into the tubers causing severe damage and affecting the commercial valué of harvested potato tubers.Facultad de Ciencias Naturales y Muse

New Potential Potato Pest in Argentina, Maecolaspis bridarollii (Bechyné) (Coleoptera, Chrysomelidae, Eumolpinae)

En muestreos realizados en cultivos de papa en el sudeste de la provincia de Buenos Aires (Argentina), se registro la presencia de un crisomelido eumolpino del genero Maecolaspis (Bechyne) que ocasionaba severos danos en los tuberculos. Los objetivos de este trabajo fueron: identificar al adulto, aportar datos sobre su bionomia y caracteristicas del dano que produce. Como resultado se cita por primera vez a Maecolaspis bridarollii (Bechyne) en este cultivo; se redescribe y se aportan nuevos caracteres discriminatorios. Se observo que, a partir de mediados de marzo, las larvas que alcanzaron un mayor desarrollo, danan los tuberculos, haciendoles perforaciones profundas que desmejoran su calidad comercial.A chrysomelid of the genus Maecolaspis (Bechyné) was identified as the damaging agent to potato crops in samples obtained from the southeast of Buenos Aires Province (Argentina). The objectives of this research were to identify the adult insect and produce information on its bionomics and on the characteristics of the damage it causes. For the first time Maecolaspis bridarollii (Bechyné) is reported affecting potatoes. According to results, the best harvesting time to reduce damage was immediately after the potato crop completed its growth cycle, henee limiting exposure to the attack of mature M. bridarollii larvae on potato tubers. From mid-March the larvae that had reached full development bored into the tubers causing severe damage and affecting the commercial valué of harvested potato tubers.Facultad de Ciencias Naturales y Muse

Influence of Plant Diversity on the Numerical Response of Eriopis connexa (Coleoptera: Coccinellidae) to Changes in Cereal Aphid Density in Wheat Crops

Cereal aphids cause economic injury to wheat crops. In Argentina, Eriopis connexa is an indigenous ladybird. In the present study, the numerical response of E. connexa to changes in aphid density on wheat crops with high and low plant diversity was investigated. The study was carried out in Balcarce, Buenos Aires, Argentina, from September to December 2007 and 2008, on two wheat crops with either a higher plant diversity (HPD) with refuge strips or a lower plant diversity (LPD) without refuge strips. Crops were sampled every week and the abundance of aphids and E. connexa was recorded. The dominant aphid species were Schizaphis graminum, Metopolophium dirhodum, and Sitobion avenae. Eriopis connexa showed a linear increase in the numerical response to an increase in aphid density, which varied in space and time. The abundance of E. connexa increased in relation to the crop development and aphid population and was higher in the HPD than in the LPD system. This predator increased its reproductive numerical response only in 2008, with a significant liner response in the HPD system. This suggests that the potential of E. connexa as a predator of cereal aphids also increases directly in proportion to landscape vegetal diversity

Fig. 5 in Biological Aspects Of Colaspis Bridarollii (Bechyné) (Coleoptera: Chrysomelidae: Eumolpinae) In Argentina

Fig. 5. Seasonal phenology of C. bridarollii on a pasture. Buenos Aires, Argentina. 1991–1993. Graph top: Total number of individuals, in all developmental stages, found in soil samples per mo.Published as part of <i>Lopez, Alicia N., Alvarez Castillo, Hector A., Carmona, Dora, Manetti, Pablo L., Mondino, Eduardo & Vincini, Ana M., 2002, Biological Aspects Of Colaspis Bridarollii (Bechyné) (Coleoptera: Chrysomelidae: Eumolpinae) In Argentina, pp. 259-269 in The Coleopterists Bulletin 56 (2)</i> on page 267, DOI: 10.1649/0010-065X(2002)056[0259:BAOCBB]2.0.CO;2, <a href="http://zenodo.org/record/10103159">http://zenodo.org/record/10103159</a&gt

Fig. 4 in Biological Aspects Of Colaspis Bridarollii (Bechyné) (Coleoptera: Chrysomelidae: Eumolpinae) In Argentina

Fig. 4. Number of eggs/d laid by C. bridarollii and mean incubation period.Published as part of <i>Lopez, Alicia N., Alvarez Castillo, Hector A., Carmona, Dora, Manetti, Pablo L., Mondino, Eduardo & Vincini, Ana M., 2002, Biological Aspects Of Colaspis Bridarollii (Bechyné) (Coleoptera: Chrysomelidae: Eumolpinae) In Argentina, pp. 259-269 in The Coleopterists Bulletin 56 (2)</i> on page 266, DOI: 10.1649/0010-065X(2002)056[0259:BAOCBB]2.0.CO;2, <a href="http://zenodo.org/record/10103159">http://zenodo.org/record/10103159</a&gt

Predation on the slug Deroceras reticulatum (Pulmonata: Stylommatophora) by Scarites anthracinus (Coleoptera: Carabidae)

La babosa gris grande Deroceras reticulatum se ha convertido en una plaga importante de los cultivos de girasol (Helianthus annuus L.) y soja (Glycine max L.) en siembra directa del sudeste de la provincia de Buenos Aires, Argentina. Por su parte, los carábidos (Coleoptera: Carabidae), son importantes componentes de la comunidad de artrópodos en los agroecosistemas y tienen el potencial para reducir las poblaciones de invertebrados. Determinamos la predación de Scarites anthracinus sobre huevos y juveniles de diferente masa corporal (10, 20 and 30 mg) de D. reticulatum, en experimentos de no elección en condiciones controladas de laboratorio, y la preferencia alimentaria por juveniles de babosas y bichos bolita Armadillidium vulgare de tamaño similar, en experimentos de elección. S. anthracinus consumió huevos y juveniles de babosas con una tasa de consumo mayor de individuos de 20 mg. A pesar de una mayor preferencia por bichos bolita durante las primeras 24 h del ensayo, los resultados sugieren que S. anthracinus podría actuar como enemigo natural de D. reticulatum en condiciones de campo, consumiendo huevos y juveniles de diferente masa corporal.The grey field slug Deroceras reticulatum has become a pest in no tillage sunflower (Helianthus annuus L.) and soybean (Glycine max L.) crops in the southeast of Buenos Aires province, Argentina. Ground beetles (Coleoptera: Carabidae) are an important component of the arthropod community in agricultural systems and have the potential to reduce pest populations. We tested the predation capacity of the carabid beetle Scarites anthracinus on Deroceras reticulatum individuals of different body mass (10, 20 and 30 mg) and on their eggs, in a controlled laboratory no-choice assay. We also tested its preference for juvenile slugs and the similarly-sized pillbugs (Armadillidium vulgare), under choice conditions. This beetle preyed upon both eggs and juvenile slugs, with the highest consumption rate on 20 mg body mass individuals. While preferring the pillbug during the first 24 h of the choice test, our results suggest that in field conditions, S. anthracinus might be a natural enemy of D. reticulatum, consuming slug eggs and juveniles of different body mass

Fig. 2 in Biological Aspects Of Colaspis Bridarollii (Bechyné) (Coleoptera: Chrysomelidae: Eumolpinae) In Argentina

Fig. 2. Age­specific survivorship of adults (males and females) of C. bridarollii. A. N = 50, B. N = 42, C. N = 82.Published as part of <i>Lopez, Alicia N., Alvarez Castillo, Hector A., Carmona, Dora, Manetti, Pablo L., Mondino, Eduardo & Vincini, Ana M., 2002, Biological Aspects Of Colaspis Bridarollii (Bechyné) (Coleoptera: Chrysomelidae: Eumolpinae) In Argentina, pp. 259-269 in The Coleopterists Bulletin 56 (2)</i> on page 264, DOI: 10.1649/0010-065X(2002)056[0259:BAOCBB]2.0.CO;2, <a href="http://zenodo.org/record/10103159">http://zenodo.org/record/10103159</a&gt

Fig. 6 in Biological Aspects Of Colaspis Bridarollii (Bechyné) (Coleoptera: Chrysomelidae: Eumolpinae) In Argentina

Fig. 6. Phenology of C. bridarollii on potato crop. Buenos Aires, Argentina. 1991–Published as part of <i>Lopez, Alicia N., Alvarez Castillo, Hector A., Carmona, Dora, Manetti, Pablo L., Mondino, Eduardo & Vincini, Ana M., 2002, Biological Aspects Of Colaspis Bridarollii (Bechyné) (Coleoptera: Chrysomelidae: Eumolpinae) In Argentina, pp. 259-269 in The Coleopterists Bulletin 56 (2)</i> on page 267, DOI: 10.1649/0010-065X(2002)056[0259:BAOCBB]2.0.CO;2, <a href="http://zenodo.org/record/10103159">http://zenodo.org/record/10103159</a&gt

Biological Aspects Of Colaspis Bridarollii (Bechyné) (Coleoptera: Chrysomelidae: Eumolpinae) In Argentina

Lopez, Alicia N., Alvarez Castillo, Hector A., Carmona, Dora, Manetti, Pablo L., Mondino, Eduardo, Vincini, Ana M. (2002): Biological Aspects Of Colaspis Bridarollii (Bechyné) (Coleoptera: Chrysomelidae: Eumolpinae) In Argentina. The Coleopterists Bulletin 56 (2): 259-269, DOI: 10.1649/0010-065X(2002)056[0259:BAOCBB]2.0.CO;2, URL: http://dx.doi.org/10.1649/0010-065x(2002)056[0259:baocbb]2.0.co;

Fig. 3 in Biological Aspects Of Colaspis Bridarollii (Bechyné) (Coleoptera: Chrysomelidae: Eumolpinae) In Argentina

Fig. 3. Age­specific survivorship of adult females of C. bridarollii and age­specific reproduction. A. N = 25, B. N = 21, C. N = 41Published as part of <i>Lopez, Alicia N., Alvarez Castillo, Hector A., Carmona, Dora, Manetti, Pablo L., Mondino, Eduardo & Vincini, Ana M., 2002, Biological Aspects Of Colaspis Bridarollii (Bechyné) (Coleoptera: Chrysomelidae: Eumolpinae) In Argentina, pp. 259-269 in The Coleopterists Bulletin 56 (2)</i> on page 265, DOI: 10.1649/0010-065X(2002)056[0259:BAOCBB]2.0.CO;2, <a href="http://zenodo.org/record/10103159">http://zenodo.org/record/10103159</a&gt