Predation is the key mortality factor for <i>Brevicoryne brassicae</i> in cabbage crops

Fidelis, Elisangela Gomes; Santos, Abraão Almeida; Sousa, Filipe Fernandes de; Silva, Ricardo Siqueira da; Dângelo, Rômulo Augusto Cotta; Picanço, Marcelo Coutinho

doi:10.1080/09583157.2018.1516735

Cited by 11 publications

(8 citation statements)

References 47 publications

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“…However, also the expectable reduced wind speed and some shelter from hard rain under the net cover could reduce mortality of these rather small pest species. In a study of Fidelis et al (2018), rain and physiological disturbance added to the mortality, although they were not the most important factors.…”

Section: Discussionmentioning

confidence: 95%

“…10). Ladybirds and spiders play a major role in control of aphids, for instance Fidelis et al (2018) revealed the most prominent mortality factors of B. brassicae in cabbage fields to be Syrphid larvae, Coccinellidae, Aphidoletes larvae and spiders, listed in order of their importance. Ludwig and Meyhöfer (2016) also found a significant reduction in spiders under 0.8 mm meshed net covers on Brussel sprouts, and an increase in Myzus persicae.…”

Section: Discussionmentioning

confidence: 99%

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Effects of insect net coverage in field vegetables on pests, diseases, natural enemies, and yield

Böckmann

2022

J Plant Dis Prot

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With the reduced availability of effective plant protection products, alternative control measures gain importance. Insect net covers are a promising tool in this regard, because they can reduce pest damage on crop by exclusion of pests. However, as under practical conditions, most crop net covers need to be removed several times during a crop cycle to manage weeds and apply fertilizers, a complete exclusion of pests is not always feasible. In addition, net covers also have an impact on natural enemies, on microclimate, and may cause direct crop damage due to their tracking weight. Therefore, effects of net applications have to be assessed accordingly, depending on the specific crops and pests. In the current paper, effects on pests, on yield, and on the occurrence of diseases are assessed in Chinese cabbage, carrot, and leek. Whereas control of Delia radicum, Phyllotreta spp. and thrips was enhanced, aphids and mining flies showed increased population build ups and caused higher damages under net cover once they had been able to invade. Some plant diseases such as Puccinia spp. and Alternaria spp. did increase under the net covers. Pitfall trap catches in carrots and Chinese cabbage were lower in almost all natural enemy groups monitored under net covers as compared to open field plots. Yield was higher with net coverage in case of Chinese cabbage and leek, but not in carrot. Results are discussed and take into account the exclusion of natural enemies and measured changes in microclimate and photosynthetically active radiation.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Effects of insect net coverage in field vegetables on pests, diseases, natural enemies, and yield

Böckmann

2022

J Plant Dis Prot

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“…In total, 442 specimens of 66 species belonging to 26 genera of three Syrphidae subfamilies were recorded in two phytophysiognomies of the RBUB, with 279 specimens captured in ight traps and 163 captured with entomological nets (Supplementary Material 1, Table S1). Unique species were collected with each technique, with the passive collection technique resulting in a greater number of unique species (30) than the active collection technique (19). Only 17 species were collected by both collection techniques.…”

Section: Resultsmentioning

confidence: 99%

Phytophysiognomy and temperature in an environmental preservation area in southern Minas Gerais influence the diversity and abundance of Syrphidae (Diptera) species

Maciel

Morales

Faria

et al. 2022

Preprint

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Syrphidae (Diptera) are a group of organisms that are considered important for the maintenance of the environment because they perform various ecological services, such as pollination, biological control, and decomposition. However, Syrphidae is still among the least studied Diptera families in the Neotropical Region due to the lack of specialists, along with the great diversity of behaviors among species and a large number of species. This study aimed to investigate the composition of adult syrphids in an environmental preservation area over two years and to verify the influence of meteorological conditions on the abundance, richness, and composition of the species collected. The sampling of adults was performed with passive traps and active searches in the Cerrado sensu stricto and Mata de Galeria phytophysiognomies between October 2018 and August 2020. In total, 442 specimens from 66 species of Syrphidae were collected. The genus Toxomerus had the highest number of specimens, and the most abundant species were T. lacrymosus (Bigot, 1884) and T. laenas (Walker, 1852). The Cerrado showed the highest abundance of syrphids, while richness was not significantly affected by any variable. In addition to the collection site, abundance was negatively affected by temperature and positively affected by the collection technique. For diversity, only the collection site had a significant effect. It was concluded that the phytophysiognomy as well as the environmental conditions influenced the diversity of this group. Implications for insect conservation: The results showed that very high temperatures negatively affected the number of specimens collected, suggesting a low ability to survive in warmer environments. Additionally, different phytophysiognomies showed differences in the diversity of insects from the family Syrphidae, and therefore, the preservation of both phytophysiognomies has the potential to assist in the maintenance of syrphid species and ensure the continuity of ecological services provided by these insects.

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“…15,16 The aphidophagous beetle E. connexa is a key predator in many agroecosystems, including Brassica crops. [17][18][19] Although aphids are the preferential prey of E. connexa, it also consumes spider mites, thrips, whiteflies, psyllids, lepidopteran eggs and young lepidopteran larvae, 20,21 including those of P. xylostella. 22,23 In Brazil, a population of E. connexa was reported as resistant to different pyrethroids.…”

Section: Introductionmentioning

confidence: 99%

Predation performance and survival of susceptible and pyrethroid‐resistant Eriopis connexa Germar (Coleoptera: Coccinellidae) to insecticides used in brassica crops

Lira

Nascimento

Barbosa

et al. 2023

Pest Management Science

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BACKGROUND Selective insecticides and insecticide‐resistant natural enemies are components of chemical and biological methods that can be compatible in an integrated pest management (IPM) program. Many insecticides that are labeled for treatment against insects in Brassica crops have lost their efficacy because of the development of resistance. However, natural enemies can provide an important role in regulating the population of these pests. RESULTS Survival of Eriopis connexa populations was >80% when exposed to insecticides, except for EcFM exposed to indoxacarb and methomyl. Bacillus thuringiensis, cyantraniliprole, chlorfenapyr and spinosad caused high mortality of P. xylostella larvae, but neither affected E. connexa survival nor its predation upon L. pseudobrassicae. Cyantraniliprole, chlorfenapyr, deltamethrin and methomyl caused high mortality of L. pseudobrassicae, but did not affect E. connexa survival nor its predation upon P. xylostella larvae. According to the differential selectivity index and the risk quotient, chlorfenapyr and methomyl were more toxic to P. xylostella larvae than to E. connexa, whereas indoxacarb was more toxic to E. connexa. CONCLUSION This study demonstrates that the insecticides B. thuringiensis, cyantraniliprole, chlorantraniliprole, deltamethrin, chlorfenapyr, spinosad, azadiracthin and spiromesifen are compatible with insecticide‐resistant adult E. connexa within an IPM program in Brassica crops. © 2023 Society of Chemical Industry.

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Predation is the key mortality factor for Brevicoryne brassicae in cabbage crops

Cited by 11 publications

References 47 publications

Effects of insect net coverage in field vegetables on pests, diseases, natural enemies, and yield

Effects of insect net coverage in field vegetables on pests, diseases, natural enemies, and yield

Phytophysiognomy and temperature in an environmental preservation area in southern Minas Gerais influence the diversity and abundance of Syrphidae (Diptera) species

Predation performance and survival of susceptible and pyrethroid‐resistant Eriopis connexa Germar (Coleoptera: Coccinellidae) to insecticides used in brassica crops

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