TESTING A LIGHT TRAP WITH A SEPARATING INSECT RECEIVER ON A SUNFLOWER.

2020 ◽  
Author(s):  
A.A Pachkin ◽  
◽  
O.Y. Kremneva ◽  
M.V. Ivanisova ◽  
◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Trap ◽  
Mass Capture ◽  
Lepidoptera Noctuidae

The results of using an aspiration light trap for the mass capture of insects in the sunflower agrocenosis are presented. Its high efficiency in capturing phytophages (Lepidoptera; Noctuidae) has been shown.In the period of 3-5 days, the trap was caught up to 600-800 individuals. The effectiveness of using a separating insect receiver is revealed. The use of separation has reduced the capture of useful and indifferent entomofauna by 52 times. During the experiment, massive oviposition of various species of scoops was noted in the cavity of the insect receiver

Light-trap catches of African armyworm moths, Spodoptera exempta (Walker) (Lepidoptera: Noctuidae), in relation to rain and wind

1983 ◽  
Vol 73 (2) ◽  
pp. 315-319 ◽  
Author(s):  
M. R. Tucker
Keyword(s):  
East Africa ◽  
Light Trap ◽  
Spodoptera Exempta ◽  
Trap Catch ◽  
Early Season ◽  
African Armyworm ◽  
Light Wind ◽  
Trap Catches ◽  
Lepidoptera Noctuidae ◽  
Very High

AbstractThe association between weather and light-trap catches of Spodoptera exempta (Wlk.) was examined for four traps in East Africa, using whole–night catches and several years' data. Large increases in trap catch were found to be (1) significantly associated with rain at all four traps for the period December–March, but not for later in the season; (2) significantly associated with light wind periods at Muguga for December–May, but not later in the year, and not at Nakuru, due to the very high overall frequency of light winds there; and (3) not significantly associated with windshifts at either Muguga or Nakuru. These results suggest that high densities of flying moths, which may give rise to caterpillar outbreaks early in the year, often occur where the rather infrequent early–season rains fall.

Predicting the severity of Spodoptera exempta (Lepidoptera: Noctuidae) outbreak seasons in Tanzania

1995 ◽  
Vol 85 (4) ◽  
pp. 479-487 ◽  
Author(s):  
A.W. Harvey ◽  
G.A. Mallya
Keyword(s):  
East Africa ◽  
Negative Correlation ◽  
Seasonal Pattern ◽  
Light Trap ◽  
Spodoptera Exempta ◽  
Convergence Zone ◽  
Light Traps ◽  
Inter Tropical Convergence Zone ◽  
African Armyworm ◽  
Lepidoptera Noctuidae

AbstractOutbreaks of the African armyworm, Spodoptera exempta (Walker), in East Africa follow a seasonal pattern related to the movement of the inter-tropical convergence zone. The season typically begins in central Tanzania with primary outbreaks that coincide with the arrival of the rains. An analysis of 27 years' light trap records shows a high negative correlation between the total number of moths caught by light traps during the season over the whole country and the number of rain days during November in central Tanzania. Out of the 27 seasons, 22 could have been correctly predicted as ‘light’ or ‘severe’, using the November rainfall at one station, Dodoma, in time to give two months' warning before the peak of the season.

Activity of adult Heliothis armigera (Hb.) (Lepidoptera, Noctuidae) with reference to the flowering of sorghum and maize in Botswana

1975 ◽  
Vol 65 (3) ◽  
pp. 523-530 ◽  
Author(s):  
R. E. Roome
Keyword(s):  
Light Trap ◽  
Heliothis Armigera ◽  
Crop Plants ◽  
Night Time ◽  
Crop Varieties ◽  
Dryland Crops ◽  
Lepidoptera Noctuidae

AbstractNight-time observations on adults of Heliothis armigera (Hb.), and data from light-trap and hand net catches in irrigated and dryland crops, showed that both sexes flew and fed and females oviposited between 20.00 and 23.00 h. From then until 02.00 h both sexes were inactive, but. from 02.00 to 04.00 h the males flew above the crop in a ‘purposeful’ manner, while the females were stationary and releasing pheromone. During this period of high male and low female activity, copulation in cages, assembly of males to females in cages and copulating pairs on crop plants were all observed. Inseminated female H. armigera were collected in crops which were at a stage suitable for oviposition, while traps away from crops or near mature crops collected mainly virgin females. It is suggested that susceptible crops attract H. armigera adults and that, once within the crop, inseminated females are ‘trapped’ by suitable physiological cues from the plants. Identification of such cues could assist in the breeding of crop varieties resistant to H. armigera attack.

The incidence and distribution of the armyworms Mythimna convecta (walker) and Persectania spp. (Lepidoptera: Noctuidae) and their parasitoids in major agricultural districts of Victoria, south-eastern australia

1986 ◽  
Vol 76 (2) ◽  
pp. 199-210 ◽  
Author(s):  
G. McDonald ◽  
A. M. Smith
Keyword(s):  
Light Trapping ◽  
Light Trap ◽  
Field Studies ◽  
Abundant Species ◽  
Crop Damage ◽  
Eastern Australia ◽  
Two Generations ◽  
Regular Sampling ◽  
Trap Catches ◽  
Lepidoptera Noctuidae

AbstractField studies of Mythimna convecta (Walker), Persectania ewingii (Westwood) and P. dyscrita Common, and their associated parasitoids, were conducted in cereals and pastures in Victoria, Australia, in 1980–83. The study included a survey of the armyworm fauna in the major agricultural districts, detailed phenological studies within five oat crops, and ultraviolet-light trapping of adults. M. convecta was the most abundant species in cereals and was found more commonly in the warmer months of spring and summer in all districts. Larval development in oat crops during spring was preceded by little moth activity in light traps. P. ewingii was common in the southern districts and in the cooler months from May to September. It was the most prevalent armyworm species in pastures and rarely occurred in barley. P. dyscrita was the least abundant species and occurred mostly in the drier inland areas, particularly in the west. Light-trap catches of P. ewingii and P. dyscrita suggested there were two generations, one in spring and one in the autumn. Regular sampling in oat crops showed that M. convecta developed faster and was usually more abundant than P. ewingii during seed development and ripening, and hence had the potential to inflict more crop damage. Of the 17 species of parasitoids reared from field-collected larvae, the wasp Campoletis sp. was the most abundant. In 1980–82, average parasitism ranged from 13 to 16% but fell to 2% after the drought of 1982.

Some effects of weather and moonlight on light-trap catches of the army-worm, Spodoptera exempta (Walker) (Lepidoptera: Noctuidae), at Muguga, Kenya

1978 ◽  
Vol 68 (4) ◽  
pp. 533-542 ◽  
Author(s):  
R. J. Douthwaite
Keyword(s):  
Wind Speed ◽  
Wind Direction ◽  
Geometric Mean ◽  
Light Trap ◽  
Spodoptera Exempta ◽  
Wind Speeds ◽  
Large Numbers ◽  
Trap Catches ◽  
The Relationship ◽  
Lepidoptera Noctuidae

AbstractThe effects of wind speed, wind direction, strong moonlight and rainfall on hourly light-trap catches of adult Spodoptera exempta (Wlk.) made at Muguga, Kenya, between January and June in 1970 and 1971 were investigated. The highest catches occurred in winds of 2–3 m/s, but generally, fewer moths were caught as wind speed increased. In totally dark hours the geometric mean catch at wind speeds of 5–6 m/s was about one-tenth that at 0–1 m/s. The relationship between catch and wind speed changed between January and June. Wind direction and change in direction were not significantly related to catch. The geometric means of catches made in strong moonlight were about one-tenth those in total darkness at comparable wind speeds. Rainfall was associated with higher catches in seven out of eight months, but the differences were significant in only two months. Recognition of the association between light winds and large numbers of S. exempta should assist forecasting, but a fuller understanding of the relationship between light-trap catch and population requires a method of population assessment that is independent of the effects of weather and moonlight.

scholarly journals Comparative status of insecticide resistance in the Helicoverpa and Heliothis species (Lepidoptera: Noctuidae) of south India

1996 ◽  
Vol 86 (5) ◽  
pp. 525-531 ◽  
Author(s):  
Deepak R. Jadhav ◽  
Nigel J. Armes
Keyword(s):  
Helicoverpa Armigera ◽  
Light Trap ◽  
The Other ◽  
Helicoverpa Assulta ◽  
Datura Metel ◽  
Cropping Season ◽  
Wild Host ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae ◽  
Heliothis Peltigera

AbstractHelicoverpa armigera (Hübner), H. assulta Guenée and Heliothis peltigera (Denis & Schiffermüller) were collected as mixed populations from safflower and the wild host Datura metel, from Patancheru, Andhra Pradesh, India, in 1992 and 1993, and their toxicological responses to insecticides determined. Both Helicoverpa armigera strains were highly resistant to cypermethrin, fenvalerate, endosulfan and quinalphos insecticides, based on resistance ratios relative to laboratory reared susceptible strains. There was no evidence of resistance development in H. assulta and Heliothis peltigera to the same chemicals. Light trap data collected from 1974 to 1987 showed that Helicoverpa armigera was at least 100 × more abundant than the other two species over most of the cropping season. Peak catches of H. assulta and Heliothis peltigera were confined to defined times in the season, corresponding with the flowering and fruiting periods of their respective host plants; August-October for Helicoverpa assulta and November-December for Heliothis peltigera. Helicoverpa armigera on the other hand, because of its high polyphagy on commercial and wild hosts, was abundant between August and April. Resistance has not developed in H. assulta and Heliothis peltigera in southern India, probably because of their restricted host range, limiting exposure to insecticides.

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