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Diurnal and seasonal flight activity of males and population dynamics of fall webworm moth, Hyphantria cunea , (Drury) (Lep., Arctiidae) monitored by pheromone traps
Author(s) -
Zhang QingHe,
Schlyter F.,
Chu Dong,
Ma XiYing,
Ninomiya Yasuo
Publication year - 1998
Publication title -
journal of applied entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0931-2048
DOI - 10.1111/j.1439-0418.1998.tb01538.x
Subject(s) - hyphantria , biology , phenology , sunset , sex pheromone , pheromone , sunrise , pheromone trap , attraction , population , nonanal , lepidoptera genitalia , biological dispersal , zoology , ecology , horticulture , atmospheric sciences , demography , food science , linguistics , philosophy , physics , astronomy , sociology , geology
Synthetic pheromone trap captures of Hyphantria cunea (Drury) (Lep., Arctiidae) males were compared with those of virgin female‐baited traps and with visual observations. Delta‐traps with females and Uni‐traps with synthetic pheromone (1Z,3Z,6Z‐9,10‐epoxyheneicosatriene, 3Z,6Z‐9,10‐epoxyheneicosadiene, and 9Z,12Z,15Z‐octadecatrienal; total, 2–6 mg/dispenser) and visual observation at a fixed point were used. The diurnal rhythm of activity in the little studied first (spring) generation showed a broad peak (3 h) after sunset. The second (summer) generation showed a short (1.5 h) but intense peak of attraction before sunrise, both to natural and to synthetic pheromones. A second small peak, just after sunset, was detected only in traps with the synthetic bait. Males started to be attracted to females about 1 h later than to synthetics in both generations. The main flight of males (mid‐50% of cumulative male catches) was longer (8–11 days) in the first than in the second generation (5–7 days). The catches of males were increased by high daily maximum temperatures in the spring generation, while rain suppressed activity (phenology was delayed) in both generations. The total period of activity detectable by visual observations was about 6 days shorter than by pheromone traps. Population trends were recorded over four generations 1992–94 in two sites by trapping of moths and counting of larval webs. The second (summer) generation was two to six times larger than the spring generation. There was a correlation between the log‐transformed catch of males and larval webs ( r = 0.92 for proportions of both infested trees and web density) of the same period. This allows prediction of the subsequent larval abundance (offspring) based on adult (parent) pheromone trapping in preceding weeks.