Soybean Looper (Lepidoptera: Noctuidae) Oviposition on Cotton and Soybean of Different Growth Stages: Influence of Olfactory Stimuli

Abstract

Soybean looper, Pseudoplusia includens (Walker), oviposition in cotton, Gossypium hirsutum L., and soybean, Glycine max (L.) Merr., of various stages of plant phenological development was evaluated in field cages in 1994, 1995, and 1996. Overall, females preferred to oviposit on soybean over cotton when both crops were compared in vegetative or prebloom stages, when both crops were blooming, and when soybean was blooming or in early pod stage compared with prebloom cotton. Females preferred to deposit eggs on the lower leaf surface in the upper two-thirds of the plant canopy in cotton and soybean. Oviposition in upper and middle canopy levels varied with plant growth stage. Females tended to lay more eggs in the upper canopy compared with the middle canopy in prebloom cotton and vegetative soybean; more eggs were laid in the middle canopy of blooming cotton and reproductive stages of soybean. Females responded to both cotton and soybean volatiles in an olfactometer. There was no significant difference in response to the two sources of volatiles.

Population Fluctuation and Vertical Distribution of the Soybean Looper (<i>Chrysodeixis includes</i>) in Soybean Culture

“…[30] observed higher deposition of soybean loopereggs in the median region of the plants, while [17] showed higher oviposition of C. includens in the middle and higher parts of the soybean, similar to the results found by [31], whereas [32], did not observe a difference in egg deposition among these three extracts of the plant.…”

Molecular Variability and Genetic Structure of Chrysodeixis includens (Lepidoptera: Noctuidae), an Important Soybean Defoliator in Brazil

“…These temporal climatic changes could encourage the migration of moths to new areas with soybean, considering that moths of C . includens have preference to oviposit on soybean leaves [ 49 ]. Indeed, it is known that caterpillars have a food preference for soybean plants [ 50 ], and young larvae prefer to feed on young plants with low-fiber-containing leaf tissues of high digestibility [ 51 ].…”

SPATIAL DISTRIBUTION OF Chrysodeixis includens EGGS (WALKER, 1858) (LEPIDOPTERA: NOCTUIDAE) IN SOYBEAN CROP

“…After the population peak at 72 DAE, a reduction in the number of C. includens eggs was observed, thus, this fact can be understood by the occurrence of phenological changes in soybean plants (Jost and Pitre, 2002). In this context, according to Serpa (2018), throughout the reproductive period of soybean, there was a decline in the population of C. includens caterpillars, especially at the end of the crop cycle, since the population is smaller due to the low supply of food in the senescence period of plants.…”