Revista Colombiana de Entomología

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

James Montoya Lerma — Wed, 28 Jul 2021 00:00:00 -0500

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

Thu, 19 Aug 2021 00:00:00 -0500

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.

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

Wed, 28 Jul 2021 00:00:00 -0500

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)

Anderson Arenas, James Montoya-Lerma — Thu, 02 Sep 2021 00:00:00 -0500

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

Sat, 07 Aug 2021 00:00:00 -0500

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.

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

Thu, 22 Jul 2021 00:00:00 -0500

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.