TITLE:
Population Fluctuation and Vertical Distribution of the Soybean Looper (Chrysodeixis includes) in Soybean Culture
AUTHORS:
Daniele Zulin, Crébio J. Ávila, Eunice C. Schlick-Souza
KEYWORDS:
Glycine Max, Monitoring, Sexual Pheromone, Behavior
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.9 No.7,
June
28,
2018
ABSTRACT: The objective of this work
was to study the population fluctuation and the vertical distribution of the Chrysodeixis includes (Walker) (Lepidoptera: Noctuidae) in the leaf canopy of soybeans. The
experiments were conducted under field conditions in the experimental area of
the Embrapa Agropecuária
Oeste during the 2014/2015 harvest. Adult
monitoring was performed using Delta-type traps, baited with the pest sexual
pheromone. The eggs were collected in the soybean plants and the caterpillars
monitored through the beat cloth. The population peaks of C. includes occurred in the reproductive period of the soybean plants, although the adults
were also found in the season soybean. Although there was no significant relationship
between the trapped adults and the immature forms of C. includes sampled with the beat cloth, a significant linear and positive relationship was
found between the egg and caterpillar densities of the pest in the culture.
Adults preferentially oviposited on the lower part of the soybean plants, while
the caterpillars preferred to position themselves predominantly in the lower
and mid region of the plants. However, at warmer temperatures during the day,
the caterpillars migrate to the upper areas of the soybean plants.