2009
DOI: 10.1590/s0103-90162009000600009
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Abstract: Onion is the third most grown vegetable crop in São Paulo state, Brazil. Organic onion farming is expected to increase in the state due to the increasing demand. Pest management in organic onion farming is based on plant extracts with insecticide effects. However, the efficacy of such plant extracts has not been proved yet, and it was observed that they do negatively affect natural enemies. Plants surrounding onion fields, and that are attractive to natural enemies, may be a good option to farmers, since they … Show more

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Cited by 43 publications
(28 citation statements)
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“…This specificity explains the decrease in parasitoid density during P2, which occurred because of the decline in the L. erysimi population within this period (Figure 4). The results obtained herein indicate that the relative abundance and species richness of the natural enemies of L. erysimi vary according to the phenology (vegetative, flowering and senescence phases) of the companion plants, thus confirming previous reports relating to species of the families Asteraceae and Apiaceae (Silveira et al, 2009;Resende et al, 2012). In general, insect populations change over time according to the availability of food resources, microclimate and shelter offered by the host plants, and these elements clearly favored the continuous richness and addition of species during the present study.…”
Section: Erysimisupporting
confidence: 90%
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“…This specificity explains the decrease in parasitoid density during P2, which occurred because of the decline in the L. erysimi population within this period (Figure 4). The results obtained herein indicate that the relative abundance and species richness of the natural enemies of L. erysimi vary according to the phenology (vegetative, flowering and senescence phases) of the companion plants, thus confirming previous reports relating to species of the families Asteraceae and Apiaceae (Silveira et al, 2009;Resende et al, 2012). In general, insect populations change over time according to the availability of food resources, microclimate and shelter offered by the host plants, and these elements clearly favored the continuous richness and addition of species during the present study.…”
Section: Erysimisupporting
confidence: 90%
“…This is a promising result considering that the counting of natural enemies was performed on the kale plants themselves where predatory action against the aphids was more likely to occur. Silveira et al (2009) demonstrated that African marigolds offer conditions that favor the maintenance of natural enemies of onion pests. Climatic conditions have been shown to influence the density of L. erysimi (Bapuji Rao et al, 2013).…”
Section: Erysimimentioning
confidence: 99%
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“…A study conducted by Silveira et al (2009) showed that Marigold (Tagetes erecta) planted between rows of shallots could increase the diversity of predators in the area where it was planted. Meanwhile, Entling and Dobelli (2009) and Saona et al (2011) in their research showed that carnivorous arthropods, including spiders, were more abundant in plots planted with flowering plants.…”
Section: Discussionmentioning
confidence: 99%
“…Weeds and plants which produce pollen can also be used as food source, shelter and breeds for natural enemies (Laba et al, 2000). Silveira et al (2009) stated that Marigold (Tagetes erecta L.) grown next to the main crop onions could increase the diversity of arthropods, especially the natural enemies. The abundance of hemipteran carnivore was also reported to increase in areas with flowering plants (Frank and Kunzle, 2006).…”
Section: Introductionmentioning
confidence: 99%