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Search Results: 1 - 10 of 7478 matches for " Natural enemies "
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Aleirodídeos (Homoptera: Aleyrodidae) em plantas cítricas no Brasil: distribui??o e identifica??o
Cassino, Paulo C. R.;Nascimento, Francisco N.;
Anais da Sociedade Entomológica do Brasil , 1999, DOI: 10.1590/S0301-80591999000100008
Abstract: the geographical distribution of six species of white fly associated to citrus spp. in brazil is presented. geographica1 distribution, hosts and natural enemies were based on material from 13 brazilian states, field monitoring and visits to the more states and also review of the literature. identification key was based on genera1 characters, morphologycal and macroscopycal of the "puparium".
The Potential of Common Beneficial Insects and Strategies for Maintaining Them in Bean Fields of Sub Saharan Africa  [PDF]
Baltazar Ndakidemi, Kelvin Mtei, Patrick A Ndakidemi
American Journal of Plant Sciences (AJPS) , 2016, DOI: 10.4236/ajps.2016.73036
Abstract: Beneficial insects provide natural ecosystem services such as biological control of pests, soil formation, nutrient cycling and pollination of plants. Beneficial insects include pollinators important in the essential pollination process of all plants, and natural enemies of pests such as parasitoids and predators which are important in the suppression of pest damage to crops. Knowledge on management techniques to attract beneficial insects in the agricultural fields is a way forward to enhance agro ecosystems for increased crop production. Therefore, proper understanding and identification of natural enemies, as well as pollinators in agricultural fields, is essential in promoting biological control and pollination activity. Natural enemies and pollinators, within legume fields, play a key role in ensuring sustainable production, especially in smallholder farms. There is a limited understanding of beneficial insects and the ecosystem services they offer to the agricultural production process in much of sub-Saharan Africa. This paper reviewed and provided existing knowledge on beneficial insects in bean fields. This will give the basis for research on beneficial insects in bean fields and practices that encourage their populations.
Parasitóides de Peckia chrysostoma (Wiedemann, 1830) (Diptera: Sarcophagidae) coletados em pupários no substrato rim bovino
Bonani, Jean Patrick;Silva, Cláudio Gon?alves;Marchiori, Carlos Henrique;Torres, Lucas Castro;
Ciência e Agrotecnologia , 2006, DOI: 10.1590/S1413-70542006000200024
Abstract: the study aimed at identifying the main parasitoids of peckia chrysostoma (wiedemann, 1830) (diptera: sarcophagidae). the larvae were feed on bovine kidney. samplings were conducted from august 2003 to march 2004, in lavras, minas gerais state, brazil. a total of 921 parasitoids in 942 pupae fly were collected. the prevalence natural parasitism was 97%.
El complejo chisa (Coleoptera: Melolonthidae) asociado a cebolla y pasto en Risaralda, Colombia
Revista Colombiana de Entomología , 2008,
Abstract: abstract: during 18 months (may 2003 to august 2004) collections were made of the larvae and adults of melolonthidae (scarabaeidae-pleurosticti) in onion crops (allium fistulosum l.) and pasture (pennisetum clandestinum hochst) located in the municipality of la florida and the area surrounding the capital of pereira, risaralda (central coffee region, colombia). a total of 1,949 larval specimens were captured that represented 11 species from which the genera phyllophaga, plectris, and cyclocephala were identified, belonging to three tribes and three subfamilies of melolonthidae. the adult collection totaled 5,267 specimens belonging to the genera cyclocephala, aspidolea, golofa, heterogomphus, plectris, phyllophaga, astaena, chariodema and isonychus.
Artrópodes fitófagos e predadores associados em 20 acessos Luffa sp. em sistema organico
Leite, Germano Le?o Demolin;Moreira, Elwira Daphinn Silva;Mota, Ver?nica Alves;Ferreira, Izabel Cristina Pereira Vaz;Costa, Candido Alves da;
Revista Ciência Agron?mica , 2011, DOI: 10.1590/S1806-66902011000400022
Abstract: the objectives of this research were to verify the phytophagous arthropods and their predators in 20 accesses of vegetable loofah luffa sp. (cucurbitaceae), the distribution of the canopy of the plants in organic system and the production of fruits of the accesses. the experiment was in randomized blocks designed with 20 treatments and four replicates. the treatments were the accesses p159, p304, p466, p03, p570, p569, p467, p30, p446, p495, p125, p263, p644 and p32, from embrapa (cenargen, df, brazil) and p01, p02, p04, p05, p06 and p07, obtained in porteirinha, mg, brazil. each plot consisted of four plants luffa sp. the greatest abundance of diabrotica speciosa (germar) (coleoptera: chrysomelidae) was observed in leaves of the access p467 in reference to the others accessions of luffa sp.. trigona spinipes (fabricius) (hymenoptera: apidae) was observed in most flowers of accesses p01, p03, p30, p32, p263 and p569 and less abundant in accesses p05, p125, p159, p304, p446 and p570. the accesses of luffa sp. highest number of fruits per plant were p01, p03, p05, p06, p07, p30, p32, p125, p263, p446 and p570. the spiders and predatory coccinellidae (coleoptera) and the phytophagous cicadellidae (hemiptera) preferred to attack the adaxial side, but no statistical difference was detected between the faces to the other arthropods. t. spinipes was present in the apical part of the plant canopy. with these results, access p06 is the most suitable for cultivation, because it was one of those with higher yields and lower rates of insect attack.
Parasitismo de huevos de Paraselenis fava (Coleoptera: Chrysomelidae) en batata (Ipomoea batatas)
Revista Colombiana de Entomología , 2011,
Abstract: the occurrence of emersonella pubipennis (hymenoptera: eulophidae) parasitizing eggs of paraselenis fava (coleoptera: chrysomelidae) infesting sweet potato, (ipomoea batatas), in the region of presidente prudente, state of s?o paulo, brazil, is reported.
Oviposition and predation of Pentilia egena mulsant (Coleoptera: Coccinellidae) in response to temperature
Guerreiro, Julio César;Busoli, Antonio Carlos;Berti Filho, Evoneo;
Scientia Agricola , 2003, DOI: 10.1590/S0103-90162003000300026
Abstract: the species pentilia egena mulsant is an important predator of armored scales that occur in citrus orchards in brazil. to intensify this biological control, knowing bioecological aspects in necessary for the improvement of massal insect rearing. this research investigated the influence of temperature (19oc, 24oc and 29oc) on the number of eggs laid by p. egena and the number of aspidiotus nerii bouché scales preyed by this coccinellid. the highest number of eggs laid and of scales preyed, 5.1 ± 0.59 and 11.3 ± 0.19, respectively, occurred at 29oc. however, egg viability (52.86%) was reduced at this temperature, and was lower than those at 19oc and 24oc (78.10% and 74.07%, respectively). temperature did not affect the ladybeetle oviposition behavior as the eggs were laid under the scale of preyed a. nerii.
Spider fauna associated with wheat crops and adjacent habitats in Buenos Aires, Argentina
Armendano, Andrea;González, Alda;
Revista mexicana de biodiversidad , 2011,
Abstract: a census of spiders was undertaken in winter wheat fields of buenos aires province, argentina, as well as from their margins and from wheat stubble. spiders were collected weekly over 3 consecutive years using entomological sweeping and pitfall traps. field margins were the richest and densest habitats (h'= 3.27, j'= 0.82) and registered 52 species from 14 families, while 31 species from 13 families were found in wheat. thomisidae and araneidae were the most abundant families in the herbaceous layer of both the margins and the crop, and lycosidae in the soil litter. in contrast, 17 species from 8 families were recorded from wheat stubble, making it the least diverse habitat surveyed (h'= 1.67, j'= 0.72). these results could be related to repeated disturbance of wheat fields by harvest, tillage and other field work. furthermore, the similarity observed in the families of both margin and crop communities indicates that colonization of wheat fields is from the adjacent areas.
Efecto de las ara?as (Arachnida: Araneae) como depredadoras de insectos plaga en cultivos de alfalfa (Medicago sativa) (Fabaceae) en Argentina
Armendano,Andrea; González,Alda;
Revista de Biología Tropical , 2011,
Abstract: effect of spiders (arachnida: araneae) as predators of insect pest in alfalfa crops (medicago sativa) (fabaceae) in argentina. spiders are predators that reduce insect pest populations in agroecosystems. trials were conducted to measure the selectivity against different insect preys, the daily consumption, effect of predators alone and together with a known number of preys, and the indirect effect of predators on vegetation. for this, experimental units (1x1m) were used covered with a fine plastic mesh. misumenops pallidus, oxyopes salticus and araneus sp. were used as generalist predators, and aphids, weevils, locusts, chrysomelids and lepidoptera larvae as their potential preys. among the preys offered, the spiders preferred lepidoptera larvae compared to the other two pests groups (weevils and aphids). the maximum consumption rate was of 93.33% for lepidoptera larvae, 25.33% for aphids and 11.67% for weevils. the q index values for the three species of spiders showed a positive selectivity only for defoliating larvae. o. salticus showed the highest values of consumption rates while rachiplusia nu was the most consumed. the maximum value of consumption in 24 hours was showed by o. salticus on r. nu (c)=2.8. the association of several species of predatory spiders increased the total number of insects captured, and also showed that the addition of spiders caused a decrease in the number of leaves damaged by the effect of lepidopterous larvae. rev. biol. trop. 59 (4): 1651-1662. epub 2011 december 01
Comunidad de ara?as (Arachnida, Araneae) del cultivo de alfalfa (Medicago sativa) en Buenos Aires, Argentina
Armendano,Andrea; González,Alda;
Revista de Biología Tropical , 2010,
Abstract: spider community (arachnida, araneae) of alfalfa crops (medicago sativa) in buenos aires, argentina. over the last decades there has been an increasing interest in the use of natural enemies to control pest insects, including spiders. we studied a spider community in argentina by sampling every two weeks during 2004-2006 in one-hectare lots. soil stratum spiders were collected using nets and pitfall traps. a total of 6229 specimens were collected (15 families and 50 species). seven families were found in the herbal stratum, the most abundant were thomisidae (n=2012, 32.30%), araneidae (n=1516, 24.33%) and oxyopidae (n=604, 9.70%). the soil had 14 families, mainly: lycosidae (n=629, 10.10%) and linyphiidae (n=427, 6.85%). hunting spiders predominated: ambushers (32.99 %); stalkers (11.77%) and ground-runners (10.84%) were less common. the most abundant web building spiders were the orb weavers (27.56%). the diversity indexes were: h′=2.97, dsp=0.11 and j=0.79, evidencing a moderately diverse spider community with predominance of misumenops pallidus, oxyopes salticus, lycosa poliostoma and l. erythrognatha. the spiders were present throughout the phenological development of the crop with abundance peaks in spring and summer. rev. biol. trop. 58 (2): 757-767. epub 2010 june 02.
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