Measuring population fluctuation of jatropha stem-borer [Cophes notaticeps (Marshall)] in the Brazilian Cerrado using a new trap

Abstract

This study aimed to monitor the population fluctuation of Cophes notaticeps (Marshall) (Coleoptera: Curculionidae) in a jatropha (Jatropha curcas L.) plantation in the Federal District, Brazil, through the use of a new trap, combined with different attractive lures and trap colors. The study was conducted at Embrapa Cerrados (Planaltina/DF) in a field trial with 720 plants. The new trap, named CPAC16, was made with PVC pipes (100 mm in diameter) of about 40 cm in length, with a window (8 × 10 cm2) in its center to enable insect access. A lure compartment was fixed on the inside of the trap`s top, and a pot, containing water and detergent, was placed at its bottom to collect the insects. The traps were painted in red, yellow, blue and green. Molasses, ethanol and pineapple were used as attractive lures. The traps were in the field trial area between May 2013 and April 2014 and the insects were collected weekly. The incidence of plants presenting damage caused by C. notaticeps was evaluated in the beginning and at the end of the study. The CPAC16 trap proved efficient in monitoring C. notaticeps. About 3494 of C. notaticeps adults were collected during the study. There were no significant differences among traps painted with different colors. The most attractive lure was molasses collecting 75.2% (n = 2627) of the specimens. Although the population peak occurred in December (n = 1162), C. notaticeps were collected throughout the year. The incidence of plants attacked by C. notaticeps ranged from 66.4% (start) to 100% (end).

When a male perceives a female: the effect of waxy components on the body surface on decision-making in the invasive pest weevil

“…In fact, although the weevils tend to be attracted to specific wavelengths of light [19,58], no effective method has been established to keep weevils inside the trap. It is well known that both specific colours and pheromones exert attractiveness on various insects [59], and these cues have been exploited for the development of traps that are effective against monitoring pest species [60]. In consideration of our findings, it is worthwhile to conduct an additional treatment such as spreading weevil extracts inside the apparatus in order to ascertain whether the number of weevils captured increases significantly.…”

Increased capture efficiency of Scolytinae with modified semi-funnel trap model

“…Monitoring of Scolytinae with pheromone-baited traps (Galko et al, 2016) or ethanol (Oliveira et al, 2017;Skrzecz et al, 2019) determines population density to assist in the integrated management of these forest pests (Carvalho and Trevisan, 2015;Borkowski, 2017). The fermentation of extractives from newly cut wood forms this compound (Lemos et al, 2020;González-Peñas et al, 2020) indicating plants suitable for colonization by Scolytinae and, therefore, used in traps to attract these beetles (Klingeman et al, 2017).…”