Lagria Villosa Research Articles

A compendium of insect pests and natural enemies associated with soyabean (<i>Glycine max</i> (l.) Merrill in Calabar, a humid area

Field studies were carried out in 1992 and 1993 late cropping seasons to identify the species of insects and their effect on soyabeans in Calabar, a humid tropical environment. Two treatments were used, (that is sprayed and un- sprayed). Nuvacron (Monocrotophos), a systemic insecticide was applied at the rate of 400g a.i/ha using a CP3 knapsack sprayer. Spraying started six weeks (42 days) after planting and continued at three weekly intervals until three weeks to harvest. A total of three sprays were applied. Insect population was sampled using the direct observation and ground cloth methods. A total of thirty-seven insect species were recorded. Thirty-two of these insects were pests while five were predators. The most abundant insect pests were Coptosoma spp. belonging to the order Hemiptera, Family: Plataspidae. Others were Coleoptera (example, Lagria villosa; Chrysolagria cynicolis; Podagrica spp.; Chnootriba similis (=Epilachna similis Muls); Medythia quarterna; Chaetonecma pulla chapius) Pentatomid bugs such as Aspavia armigera (F), Nezara viridula (L) and Acrosternum acuta (Ray), Coreid bugs-Clavigralla spp. Riptorus dentipes, Alydidae, Cletus notatus, Mirperus spp and Paederus sabeaus); Orthoptera- e.g. Gymnogrillus lucens (Walker) Gryllidae). Others were unidentified lepidopterous caterpillars. Five predators were also recorded. These were Cheilomenes sulphurea (Coleoptera: Coccinellidae), Rhincoris bicolor (Hemiptera: Reduviidae), Black ants (unidentified), Sphrodomantis spp. and a number of unidentified spiders (Arachnidae). Journal of Applied Chemistry and Agricultural Research Vol. 4 1997: pp. 33-36

Insetos associados à cultura da aceroleira (<em>Malpighia glabra</em> L.) na região de Maringá, Estado do Paraná

Com o objetivo de determinar a ocorrência de insetos associados à aceroleira, Malpighia glabra L. (Malpighiaceae), foram feitos levantamentos, no período de agosto de 1997 a dezembro de 1998, na região de Maringá, Estado do Paraná, Brasil. Os insetos foram coletados quinzenalmente em 20 plantas localizadas em pomar comercial, caminhando-se ao redor da copa das plantas por um período de 10 minutos e observando-se ramos, folhas e frutos. A coleta foi realizada manualmente, através de rede entomológica, armadilha com atraente alimentar e pelo corte de quatro ramos por planta, que foram observados sob microscópio estereoscópico. As espécies encontradas foram; Nezara viridula, Piezodorus guildinii, Euschistus heros, Thyanta spp., Dysdercus ruficolis, D. peruvianus, Leptoglossus zonatus, L. gonagra, Enchenopa gracilis, Toxoptera citricidus, Saissetia coffeae, S. oleae, Coccus viridis, Chrysomphalus ficus, Selenaspidus articulatus, Orthezia praelonga, Mahanarva fimbriolata, M. posticata, Dilobopterus costalimai, Oncometopia facialis, Chrysopa sp., Polistes sp., Diabrotica speciosa, Cerotoma sp., Lagria villosa, Cycloneda sanguinea, Ceratitis capitata, Anastrepha fraterculus e Euxesta sp

Levantamento de insetos associados à batata-doce, Ipomoea batatas, com uso de armadilhas d'água, em Ituporanga, SC

Insects associated with sweet potato, Ipomoea batatas were surveyed at Ituporanga Experimental Station, EPAGRI S.A., Santa Catarina State, Brazil, from 1991 to 1994. Astylus variegatus Germ. (Coleoptera: Dasytidae) and Chaetocnema apricaria Suffr. (Coleoptera: Chrysomelidae) were abundant throughout the crop cycle. The complex of Homoptera (Aphididae: Pemphigida e and Cicadellidae), Diabrotica speciosa Germ., and Typophorus nigritus versutus Lef. (Coleoptera: Chrysomelidae) were constantly present but at lower levels than A. variegatus and C. apricaria. Systena sp. (Coleoptera: Chrysomeliadae) and Lagria villosa Fabr. (Coleoptera: Lagriidae), were casual and occurred at low frequency.

The insect pest complex of the edible roselle, Hibiscus sabdariffa var. sabdariffa L. and the damage they cause in southwestern Nigeria

A four-year survey of the insect pest complex of the edible roselle, Hibiscus sabdariffa var. sabdariffa, and the damage they cause in some parts of southwestern Nigeria showed that the vegetable has many potentially destructive pests. The major seedling and foliage pests are Podagrica sjostedti, Podagrica uniforma, Lagria villosa, Chrysolagria cuprina, Chrysolagria nairobana and Syagrus calcaratus. The major pests of the edible calyces and seeds are Baris sp, Apion sp and Earias spp. whose larvae feed inside and destroy the calyces and the developing seeds. Others are Oxycarenus gossypinus and Oxycarenus hyalinipennis which feed mainly on the seeds. The percentage damage by Baris and Apion to fruit s ranged from 10 to 210,10in fruits harvested in mid-December and from 48 to 84% ill late harvests in mid-January. the percentage germination of insect-infested and uninfested seeds were 10 and 83% respectively. The foliage pests were effectively controlled with two sprays of carbaryl at the rates of 0.5 and 1.0kg a.i./ha applied at intervals of two weeks. Fruit yield and seed viability were significantly higher in treated plots than in the control.