Revista Colombiana de Entomología

In Memoriam : HÉCTOR ARMANDO VARGAS GONZÁLEZ (1943-2021)

2021-07-28T10:06:11-05:00

Diversity of Andean potato weevils (Coleoptera: Curculionidae) on Potato (Solanum spp.) in Puno-Peru

2021-04-08T13:22:22-05:00

The Peruvian Altiplano is considered the place of origin of the potato crop
(Solanum spp.). The Altiplano is also the center of the origin of the most important insect pests, compound by different species, called the Andean potato weevils complex (Coleoptera:
Curculionidae). The present study aimed to demonstrate the diversity of species of the pests in two potato-producing communities: Jallahua and Kcoriñahui, distant between them 17 km and located at altitudes between 3883 and 4093 meters above sea level (a.s.l.), in the district Pucará, Lampa, Puno. Adults of the Andean weevil were collected from potatoes plants with Barber ́s pitfall traps, then they were classified and identified by comparison with reference material from the collection of the International Potato Center (CIP) and subsequently the identifications were verified in the laboratory with a dichotomous key. Results allowed differentiating the species: Premnotrypes solaniperda Kuschel, Cylydrorhinus sp., Listroderes punicola Kuschel, Puranius sp., Rigopsidius tucumanus Heller, Rigopsidius piercei Heller, and four unidentified species. Heterogeneity in the geographical distribution of the species was verified with Premnotrypes solaniperda Kuschel being the most dominant, the other species showed intermediate and lower densities and dominances.

Sublethal effects and costs of resistance to abamectin in diamondback moth (Plutella xylostella) (Lepidoptera: Plutellidae)

2020-12-16T16:25:01-05:00

It is essential to understand the effects of sublethal concentrations of insecticides have on the dynamics, biology, and development of pests such as Plutella xylostella, one of the most important pests in the world. This species can develop resistance to the insecticides used for its control. In the present study, abamectin selection pressure was performed for ten generations of P. xylostella, and the sublethal concentrations (CL20) and susceptible lines of the resistance were determined. Then, these concentrations were applied to third instar larvae. In two generations it was evaluated the effect on the percentage of pupae formed, pupal weight, adult emergence, and the development times of each phase from egg to adult.

The resistance and application of sublethal concentrations have considerable costs in the biology and development of P. xylostella by increasing the percentage of pupation from one generation to another, and a greater weight of pupae and eggs per female/day. However, it presents a transgenerational effect by reducing oviposition in its generation; in terms of development time, it presented a harmful effect by prolonging it by more than seven days, which would generate a greater number of applications per cycle.

Parasitoids, Braconidae (Hymenoptera) and Tachinidae (Diptera) of borers, Crambidae and Coleophoridae (Lepidoptera) of sugarcane for the production of panela in Colombia

2020-12-07T14:31:18-05:00

Sugarcane agroecosystems include natural enemies that can regulate the populations of stemborers (Lepidoptera), and this is an important role considering that biological control is the main management strategy for the crop. The goal of this research was to offer an updated list of stemborer parasitoids of sugarcane for panela from the Suárez river basin (Colombia). A total of 616 parasitoid specimens were sampled from 2015 to 2017. Out of the ten species found Alabagrus albispina, A. imitatus, A. parvifaciatus, A. roibasi (Hymenoptera:
Braconidae) and Leskia sp. (Diptera: Tachinidae) are new records for Colombia. Alabagrus
albispina, A. roibasi, and Leskia sp. are new records for the stem borers of the crop. These species may serve as new tools for biological control in sugarcane.

Report of Euseius consors (Acari: Phytoseiidae) on avocado trees of Michoacan, Mexico

2020-11-06T15:43:40-05:00

To support the description of the diversity of Phytoseiidae mites and according to biological control, the mite Euseius consors is reported for Mexico. It was collected from avocado plants (Persea americana) in seven municipalities in the state of Michoacán, associated with Oligonychus persea (Acari: Tetranychidae), one of the most important pestmites in this crop. Hence, this scientific note is a contribution to the knowledge, the basis for the description of a potential biological control agent, and the ecosystem service that it can provide.

Revisión taxonómica de los géneros de escarabajos tigre neotropicales de la subtribu Odontocheilina (Coleoptera: Cicindelidae)

2021-09-02T12:52:05-05:00

How to deal with the disadvantages of living in dense societies: traffic rules in leaf-cutting ants

2021-03-02T19:11:15-05:00

Transporting food from production centers to consumption centers is a challenge for densely populated societies. To avoid delays, the trail system must be efficient and the behavior of the transporters must reduce the probability of collisions. This work, describes how Leaf-Cutting Ants (LCA) solve these dilemmas by optimizing their trail design and performing behaviors that avoid bottlenecks and delays. On the one hand, the LCA build trails wide
enough to avoid traffic jams at times of peak foraging activity. Also, at the bifurcation points, the sum of the branching trail widths is always higher than the width of the precedent trunk
trail. Finally, LCA builds their branching trails with angles that reduce the maintenance cost of the new trail sector or of the total trail length, depending on which factor is more limiting. On the other hand, LCA shows a range of behaviors that avoid delays: minima workers can travel on the leaf fragments thereby reducing flux density, unloaded workers remove obstacles from the trail, ants carry extra-large loads mainly during situations of low traffic, ants maintain their lane when turning, and foragers show priority rules during jam situations. These examples illustrate how ants, using simple behavioral rules that arise from positive interactions among individuals, can solve complex problems such as traffic regulation.

Considerations on the status of the knowledge of coleopteran diversity (Arthropoda: Insecta) in Colombia

2021-01-28T16:46:46-05:00

Coleoptera is one of the most diverse orders on the planet, and Colombia one of the most biodiverse countries. The combination of these two factors determines with no discussion a high concentration of species, with only partially known consequences in the country. In this work we describe the current state of knowledge about the diversity of coleopterans in Colombia, highlighting the role of entomological collections and the knowledge gaps to
tackle the national beetle fauna. This contribution is a starting point for coleopterologists of Colombia to begin working together towards a broader and less fragmented knowledge of the
natural history, systematics, ecology, and biogeography of the group.

Bees as providers of cultural ecosystem services: case of the Bogotá Botanical Garden, Colombia

2020-10-28T14:56:47-05:00

The purpose of this study was to evaluate the potential of artificial domiciles for solitary bees and thereby explore ecosystem services besides pollination. Artificial modules
were installed in three previously selected areas of the Botanical Garden of Bogotá. Weekly monitoring was carried out from June (2017) to August (2019), an exhaustive monitoring
every six months and the palynological analysis of 48 samples collected from the modules.
Only the Páramo and high Andean Forest module (33.3 %) was colonised by bees (Megachile amparo, Megachile sp., Colletes sp. and Chilicola brooksi). The materials most used as nests
were perforated wooden blocks and paper tubes. The emergency rate of incubated nests was higher in Colletes sp., and no order was observed in the emergence of females and males,
while in M. amparo the emergence of males was greater. The females of Colletes sp. presented the highest colonization of nests in the study. Pollen analysis of the nests showed that Colletes sp. has a tendency to be oligolectic, while M. amparo and C. brooksi are polylectic. The low
number of species that nested in these modules may be indicative of the low potential as a conservation strategy; however, they were useful research tools to understand the habits of species with little or no information. The modules made it possible to have experiential, educational, scientific and aesthetic interactions as forms of cultural ecosystem services, as well as to formulate recommendations to consider the relevance of their implementation.

Quantitative biological response of two predators (Heteroptera: Notonectidae) in the larval control of Aedes aegypti (Diptera: Culicidae)

2020-12-17T17:38:40-05:00

Predation is a biotic factor that influences the structure and functioning of ecosystems, its effect can be quantified through functional (FR) and numerical response in a successful-invasion context. We use FR to understand the coevolutionary relationships, and measured the biological response of the predators Notonecta peruviana and Buenoa fasciata in the control of fourth-stage larvae of Aedes aegypti (F₁) at different densities (5, 10, 20, 35, 55 and 80 larvae / liter). Fasting predators (48 hours) were introduced to the test containers
(one individual per species) and the FR, the number of preys consumed (Ne), the attack coefficient (a) and handling time (Th). N. peruviana and B. fasciata developed a type II FR in the consumption of larvae of Ae. aegypti (p ≤ 0.01), and occupied close handling times (Th) (t = –1.93; df = 12; p = 0.078). N. peruviana preyed (Ne) twice as many larvae of Ae. aegypti (p ≤ 0.05) and showed a higher attack coefficient (a) in relation to B. fasciata (t = 14.92;
df = 12; p = 0.000). The predators N. peruviana and B. fasciata rapidly destabilized and consumed the preys. N. peruviana preyed twice as many larvae, attributable to the recent
predator-prey effect compared to the possible coevolutionary adjustment between B. fasciata and Ae. aegypti. It would be important to consider the predator species in the vector control
programs for aedine mosquitoes.