Effects of photoperiod and temperature on development and diapause induction on the Okayama population of Helicoverpa armigera (Hb.) (Lepidoptera : Noctuidae)

1999 ◽  
Vol 34 (3) ◽  
pp. 327-331 ◽  
Author(s):  
Hanif Qureshi Mohammed ◽  
Tamotsu Murai ◽  
Hideya Yoshida ◽  
Takashi Shiraga ◽  
Hisaaki Tsumuki
Keyword(s):  
Helicoverpa Armigera ◽  
Diapause Induction ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae

scholarly journals Populational variation in diapause-induction and -termination of Helicoverpa armigera (Lepidoptera: Noctuidae).

2000 ◽  
Vol 35 (3) ◽  
pp. 357-360 ◽  
Author(s):  
Mohammed-Hanif Qureshi ◽  
Tamotsu Murai ◽  
Hideya Yoshida ◽  
Hisaaki Tsumuki
Keyword(s):  
Helicoverpa Armigera ◽  
Diapause Induction ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae

Effects of constant and changing temperature conditions on diapause induction in Helicoverpa armigera (Lepidoptera: Noctuidae)

2011 ◽  
Vol 102 (2) ◽  
pp. 139-147 ◽  
Author(s):  
G.K. Mironidis ◽  
M. Savopoulou-Soultani
Keyword(s):  
Constant Temperature ◽  
Helicoverpa Armigera ◽  
Adult Emergence ◽  
Photoperiodic Response ◽  
Diapause Induction ◽  
Long Day ◽  
Temperature Regimes ◽  
Helicoverpa Armígera ◽  
Diapause Development ◽  
Lepidoptera Noctuidae

AbstractThe effects of photoperiod and temperature on the induction and termination of facultative pupal diapause in Helicoverpa armigera (Lepidoptera: Noctuidae) were investigated under laboratory conditions. Exposing H. armigera larvae to both constant and fluctuating temperature regimes with a mean of 25°C and 20°C resulted in a type-III photoperiodic response curve of a short-long day insect. The long-day critical daylengths for diapause induction were ten hours and 12 hours at the constant temperatures of 25°C and 20°C, respectively. Higher incidences of diapause and higher values both for the longer and the shorter critical photoperiods for diapause induction were observed at fluctuating regimes compared with the corresponding constant ones. At alternating temperatures, the incidence of diapause ranged from 4.2% to 33.3% and was determined by the temperature amplitude of the thermoperiod and by the interaction of cryophase or thermophase with the photoperiod. Helicoverpa armigera larvae seem to respond to photoperiodic stimuli at temperatures >15°C and <30°C; all insects entered diapause at a constant temperature of 15°C, whereas none did so at a constant temperature of 30°C under all the photoperiodic regimes examined. Although chilling was not a prerequisite for diapause termination, exposure of diapausing pupae to chilling conditions significantly accelerated diapause development and the time of adult emergence. Therefore, temperature may be the primary factor controlling the termination of diapause in H. armigera.

Incidence of Helicoverpa armigera (Lepidoptera: Noctuidae) and its natural enemies on smallholder crops in Kenya

1993 ◽  
Vol 83 (3) ◽  
pp. 321-328 ◽  
Author(s):  
H. van den Berg ◽  
M. J. W. Cock ◽  
G. I. Oduor ◽  
E. K. Onsongo
Keyword(s):  
Helicoverpa Armigera ◽  
Heliothis Armigera ◽  
Population Densities ◽  
Parasitoid Species ◽  
Larval Parasitoid ◽  
Total Percentage ◽  
Four Seasons ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae ◽  
Experimental Plots

AbstractSmallholder crops (sunflower, maize, sorghum and cotton) were grown in experimental plots at seven sites, representing different agricultural zones of Kenya, over four seasons. Helicoverpa armigera (Hübner) (formerly Heliothis armigera) only occasionally achieved population densities sufficient to cause obvious damage to the crops, and was virtually absent from the coastal sites. At the inland sites, infestation and mortality levels varied greatly. Information is presented on the incidence of H. armigera, and the identity, distribution and frequency of its common parasitoids and (potential) predators, sampled in the experimental plots. Trichogrammatoidea spp., egg parasitoids, and Linnaemya longirostris (Macquart), a tachinid late-larval parasitoid, were the most common parasitoid species, but total percentage parasitism was rather low. Of the large complex of predators, only anthocorids and ants (predominantly Pheidole spp., Myrmicaria spp. and Camponotus spp.) were sufficiently common and widespread to be of importance in suppressing H. armigera. The abundance of predators fluctuated widely between sites, but anthocorids were most abundant at the western sites.

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