Comparison of Phototactic Behavior between Two Migratory Pests, Helicoverpa armigera and Spodoptera frugiperda

Abstract

The fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), is an important migratory pest, causing great losses to agricultural production. Light trapping is a pesticide-free method for pest control and is influenced by many factors, especially wavelength and light intensity. In this study, a series of phototactic behavioral assays were carried out and the physical parameters were included to identify phototactic responses of S. frugiperda, with Helicoverpa armigera as control. It was found that S. frugiperda showed the highest average phototactic rate to blue light among five different LED lights. The phototactic rates of the two moths increased gradually with light intensity and were not obviously influenced by sex. In addition, the phototactic rate of S. frugiperda was significantly lower under a low light intensity of UV light than that of H. armigera, further confirmed by the indoor simulation experiment and EC50. According to the obtained parameters, the trapping distance of S. frugiperda to blue light was smaller than that of H. armigera to UV light. Therefore, we summarized a proposal of using blue light for light traps to control S. frugiperda, with a maximum distance of no more than 108 m. These results provide an experimental and theoretical basis for improving light-trapping techniques for managing S. frugiperda.

Suitability of Satellite Imagery for Surveillance of Maize Ear Damage by Cotton Bollworm (Helicoverpa armigera) Larvae

“…These results also highlight the importance of incorporating spectral band-measured reflectance values directly into CBW damage surveillance models, similarly to some yield prediction research [121,122]. Although each visible band was well-suited, there was no considerable difference among the colors, contrary to the studies revealing CBW adults' preference for particular colors [36][37][38]. Even though B02, B03, and B04 reached the highest mean PCCs, the strength of the mean PCCs remained moderate, and the variation within the PCCs were relatively high.…”

“…Monochromatic light at 395 nm and 385 nm (UV) wavelengths caught the most adults in light taps [16]. Similarly, UV light traps are found to be the most effective for CBW adult monitoring at low intensity for both sexes [38]. Some studies indicate that trap color influences CBW adult captures since they have a preference for bright colors [39].…”

“…According to our review, there is no rapid, cost-and labor-effective CBW damage surveillance method for maize, despite the high economic impact of the CBW. Satellitederived surface reflectance provides insights into the visual characteristics and changes in maize [47,55,56,70] that play an important role in determining the oviposition preferences of CBW adults under maize field conditions [13,30,[33][34][35][36][37][38][39]75]. Our hypothesis is that models, based on satellite imagery, can be developed, that will improve CBW surveillance (including both monitoring and prediction) for maize crops, aligned with an optimal time period and maize phenology.…”

Luminescence of Sm3+ in double perovskite‐type Ba2SrWO6 for insect trapping

“…For example, ultraviolet (UV) light is used to attract parasitic wasps in citrus [6]. Using blue light to catch cotton aphids [7],…”

“…For example, ultraviolet (UV) light is used to attract parasitic wasps in citrus [6]. Using blue light to catch cotton aphids [7], the Australian whitefly was trapped using the light from mercury vapour lamps [8]. Yet, it is still critical to design and fabricate light trapping systems for more pest trapping to expand its application.…”