Revista Colombiana de Entomología

New geographical records of streblids (Diptera: Streblidae) with the first record of the genus Neotrichobius in Mexico

2025-04-24T21:06:31-05:00

The first record of Neotrichobius stenopterus (Diptera: Streblidae) for Mexico is presented, as well as four new records of streblid flies for the state of Oaxaca: Anastrebla modestini, Exastinion clovisi, Trichobius dugesii, and Trichobius intermedius. With these new records the list of species of the family Streblidae for Mexico is updated from 61 to 62, of which 32 are in the state of Oaxaca, representing 51.6 % of the species reported for the country.

Diversity and abundance of mites (Acari: Mesostigmata, Sarcoptiformes and Trombidiformes) on blueberry Vaccinium corymbosum (Ericaceae) in Michoacan, Mexico

2025-01-27T16:16:38-05:00

In recent years, several species of mites have been reported as an important phytosanitary problem for blueberries. Mexico has become one of the main producers of this crop worldwide, but few studies have focused on the diversity of species present in blueberries in Mexico. Thus, the objective of this research was to report the diversity and abundance of mites associated with V. corymbosum cultivation in Michoacán (Mexico). Plant material was collected in 42 orchards of 18 municipalities of Michoacán. Samples were placed in plastic bags and stored under refrigeration at 4 °C. Mites were processed for mounting in semi-permanent preparations with Hoyer's solution and identified using taxonomic keys. A total of 17 species of mite belonging to 12 genera, five families and three orders were collected. The families with the greatest abundance were Tetranychidae and Tenuipalpidae. Whereas Phytoseiidae was the most diverse with 11 species. The municipality of Peribán and the Biloxi variety were those that presented the greatest diversity and abundance. Of the identified species Oligonychus ilicis, Neoseiulus rufus, Typhlodromips jimenezi and Metaseiulus bidentatus are new records for Mexico. The phytophagous species O. ilicis and Brevipalpus yothersi must be further studied since they can become important pests for the crop. This research will be a starting point for further study of mites in blueberries in Mexico.

Effect of six diets during the larval and adult period of Aedes aegypti (Diptera: Culicidae) under laboratory conditions

2025-03-19T09:40:41-05:00

Rearing the laboratory vector Aedes aegypti (Diptera: Culicidae), a disease vector, necessitated diets nutritionally rich in protein and carbohydrates, yet low in fat. The objective of this study was to evaluate and compare the effects of various diets on larval and adult stages, with a specific focus on wing size. Six diets were compared: CIETROP-CC concentrate, fish-based diets (Nutrafin-NF and Aqua One-AO), carnivore-based diets (Ricocan-RC and Supercat-SC), and brewer's yeast (LV). The development of larval stages was assessed using Kaplan-Meier survival analysis, while wing length was compared using Mood's median test. The developmental duration from larva to adult was consistent across all six diets, averaging 13 days. Larvae fed LV exhibited a lower survival rate (88 %) compared to the other diets (99%). Female wing size ranged from 2.81 to 2.93 mm, with a mean of 2.88 mm and a standard deviation of 0.12, while male wing size ranged from 2.18 to 2.28 mm, with a mean of 2.23 mm and a standard deviation of 0.17. All diets supported satisfactory larval development, with no significant differences observed in larval survival or developmental duration (P > 0.05). Notably, the CIETROP-CC and commercial diets yielded similar results. These findings indicate that the laboratory-prepared diet exhibited comparable performance to the other five diets in terms of survival and developmental rates. Further analysis will enable the determination of its specific nutritional composition. The results underscore the efficacy of commercial diets in supporting larval.

Evaluación de la patogenicidad de Metarhizium robertsii y Beauveria bassiana contra Chloridea virescens (Lepidoptera: Noctuidae)

2025-04-04T14:01:55-05:00

In Mexico, Chloridea virescens is a pest of chickpea, tomato and other vegetables causing significant economic losses. To control this pest, three different strains (M1, M2 and M3) of Metarhizium robertsii (Previously Metarhizium anisopliae) and three strains of Beauveria bassiana (B1, B3 and B9) were evaluated under laboratory conditions, based on radial growth parameters, and conidia production and germination. The pathogenicity of the best strains was assessed at concentration of 1×108 conidia/mL, against second and third instar larvae of C. virescens, at 28 ± 1 °C, 70 ± 5 % of relative humidity and a photoperiod of 12 hours light. The six strains caused larvae mortality of C. virescens, ranging from 57 % to 97 %, with statistically significant differences compared with the control (P < 0.02). The M1 strain of M. robertsii exhibited the highest radial growth of 4.79 ± 0.02 cm, a growth rate of 3.33 mm/day, and a production of 6×109 conidia/mL at 14 days, with 96 % of germination at 24 hours. In terms of pathogenicity M1 caused 97 % of total larvae mortality at 7 days with TL50 of 4 days. The M2 and M3 strains caused mortality of 83 % and 77 % with a TL50 of 4 days. Strains B1, B3 and B9 have mortalities of 63 %, 57 % and 70 % with a TL50 of 4,3 days. (M1) M. robertsii had the best performance across all evaluated parameters, and it is therefore recommended for field testing to control of C. virescens.

In Memoriam AMADOR VILLACORTA MOSQUEIRA (1935-2014)

2025-01-10T17:34:00-05:00