This scientic publication in digital format is a continuation of the Printed Review: Legal Deposit pp 196802ZU42, ISSN 0378-7818.
Narrea and Gómez. Rev. Fac. Agron. (LUZ). 2024 41(2): e244119
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It is observed that in shelter A, fennel (Apiacea), calendula
and sunowers (Asteraceae), in that order, stood out for hosting
the largest population of predators in the study, mainly C. externa,
coinciding with similar studies that highlight fennel as an excellent
reservoir of green lacewings (Chrysopidae), hoveries (Manfrino
et al., 2011) and ladybugs (Coccinellidae) (Rebolledo et al., 2007).
As for the pollinator, it was observed that this plant hosted the
largest populations of Chrysomya sp. Calendula did not harbor any
phytophagous and, like the reports by Andorno et al. (2014), was
a shelter for ladybugs and parasitoid wasps. Coinciding with the
results of Ramírez-Reyes et al. (2019), the sunower did not harbor
parasitoids, but if there was a high population of Thrips tabaci, this
attraction could be due to the size of the sunower owers, which,
being very large, show much more their yellow color, a color that,
according to Joyo &Narrea (2015), exerts an attractive eect on thrips
to the point that it is common to use yellow sticky traps in vineyards
to attract and trap individuals of this pest.
Predators of shelter B were found mainly in zinnia (Asteraceae)
and fennel (Apiaeae); zinnia hosted the largest population of predator
C. externa of the entire study; fennel, as in shelter A, hosted the
four functional groups, of which predators were the most abundant,
although in smaller numbers than zinnia. In contrast, crotalaria
harbored few predators, more phytophagous species, and no
parasitoids. According to Van Rijn & Wäckers (2016), not all of the
plant species that make up the varied plants (plant shelters) produce
adequate resources, nor is it known for sure which species will be
most eective in hosting benecial organisms.
In shelter C, characterized by being the least abundant, least
diverse, and with the lowest population of biological controllers,
basil (Lamiacea) stood out for being the only plant in the entire study
in which no green lacewings were found; according to Adam et al.
(2019) and Hassan et al. (2015), this plant has a repellent eect against
several insects, which is one reason why this shelter had the lowest
insect population in general (20.6 % of the insects present throughout
the study); however, this repellent eect would not apply to bees,
which preferred basil over other plants, probably since, unlike other
plants, basil owers are small and open, conditions that, according to
Altieri & Nicholls (2012), make its pollen and nectar more accessible
to bees and other pollinators; crotalaria and salvia had the lowest
population records in the study, with bees being the most important
population.
Conclusions
In the three shelters evaluated, entomofauna composed of
predators, parasitoids, pollinators, and phytophagous was found;
pollinators are the most abundant and parasitoids are the least
abundant. Shelters A and B were similar in terms of the composition
of these functional groups.
Shelter A was the most abundant and, together with shelter B,
stood out for hosting the largest number of biological controllers of
the grapevine; in both shelters, fennel (Foeniculum vulgare) was the
outstanding plant species in richness and abundance of predators,
followed by calendula (Calendula ocinalis) (shelter A) and zinnia
(Zinnia acerosa) (shelter B), which also contributed a signicant
share of predators and parasitoids. Of lesser abundance, shelter C was
widely inhabited by pollinators, especially Apis mellifera L., which
was found mostly in basil (Ocimum basilicum).
Among all the predators found, Chrysoperla externa (Hagen)
stands out, the main controller of the “vine mealybug” (Planococcus
spp.), which means that the installation of plant shelters in vineyard
elds could represent an additional alternative to enhance the
biological control of pests in this crop.
Recommendations
Considering that the behavior of insects can vary throughout the
day and with it the composition, dominance, and evenness of the
population in plant shelters, it is recommended to carry out similar
studies with sampling at dierent times than the one in this study.
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