Studies on the biology of Helicoverpa armigera on different semi-synthetic diet (original) (raw)
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Journal of Entomology and Zoology Studies, 2019
A study was conducted to determine the effect of artificial diets on some of the important biological parameter of Helicoverpa armigera under laboratory condition at 25±1°C, 75±5% R.H. and 14 hr photoperiod. Four locally available pulses viz., chickpea, green gram, pea and black gram were used as treatments and compared with that of the natural diet as control i.e. chickpea leaves. Sixty larvae in each treatment were fed and studied. Results revealed that larval duration was found to be the minimum in larvae reared on chickpea based diet and longer on pea, green gram and black gram respectively and maximum on chickpea leaves. Overall, the fitness index was found highest on chickpea followed by pea, green gram, black gram, black gram and chickpea leaves. The study proved that chickpea based diet was the best for mass rearing of Helicoverpa armigera while pea based diet could also be used as substitute.
EXCELENT PUBLISHER, 2018
Present investigation was carried out on five different diets (Chickpea soaked grains, Tomato fruits, Pigeon pea soaked grains, Pea soaked grains and Artificial diet) to evaluate the feeding response on growth and development parameters against Helicoverpa armigera (Hub.) at controlled conditions at 27-29oC temperature, 55-75% relative humidity and photoperiod of 10-14 (L:D)h. Growth and development was compared as different parameters such as larval period, pre-pupal period, pupal period, percent pupation, pupal weight and percent adult emergence along with preoviposition period, oviposition period, post oviposition period, fecundity, longevity and sex ratio. Growth indices values were also studied on different hosts also. The results revealed that artificial diet had relatively shorter larval period, pre-pupal period and percent pre-pupa as compared to other diets experimented followed by chickpea (grains). Longer duration of larval instars in general on the contrary has been observed with tomato (fruits). Moreover, pre-pupal and pupal weight was also observed highest on artificial diet followed by chickpea and lowest on tomato. Percent pupation and adult emergence was also recorded highest in artificial diet followed by chickpea and least on tomato. Effect of different tested diets on pre-oviposition, oviposition, postoviposition and fecundity was also found better in artificial diet followed by chickpea, tomato, pea and pigeonpea. However, the sex ratio obtained after feeding the larvae on different diets did not differ significantly. The growth index, larval-pupal index, pupal weight index, survival index and ovipositional index values were found highest with artificial diet followed by chickpea, pea and pigeonpea while it was the lowest on tomato. Therefore, from the present experiment it was concluded that artificial diet to be proved more effective in all parameters. Also it would be helpful for mass rearing of H. armigera on different food substrates which ultimately be beneficial for making better management practices of this noxious pest
2018
In few decades the insect management has changed its form i.e. natural control, bioassay based, for that a large number of laboratory reared insects are needed. The rising needs of insects also need a good amount of artificial diet, rather than natural host plants. Overcome the problem of mass rearing studies on artificial diets has been done. An ideal artificial diet should be preferred by the insect as well as cost effective. Focusing on the needs of insect mass rearing the present study was conducted to compare the enhanced artificial diets for the mass rearing of Helicoverpa armigera. Six diets were prepared by adding enriched Protein-X and Bio-D3 Max capsules on six different flours viz. chickpea, corn, soybean, rice, groundnut, sago powder and control (tomato pulp). The larval duration of H. armigera was observed minimum in soybean flour mediated diet i.e. 13.5 days and maximum in Sago powder mediated diet i.e. 20.3 days, subsequently per cent larval mortality was minimum in the soybean flour mediated diet 2.1 % and maximum in Sago powder mediated diet 20%. However, maximum % pupal recovery and adult emergence was observed in soybean based artificial diet which exhibited 92.6% and 90.5% respectively.
Indian journal of entomology, 2014
Artificial rearing of insects in the laboratory is a pre-requisite for undertaking studies on insecticide/ biopesticide bioassays, and evaluation of germplasm, segregating breeding material, mapping populations, and transgenic plants for resistance to insects. For successful rearing of insects in the laboratory, there is need for standardizing a semi-synthetic diet that supports survival and development of the insect for several generations. We tested different semi-‘synthetic diets for rearing the legume pod borer, Helicoverpa armigera for two generations under laboratory conditions. All the semi-synthetic diets tested supported the growth and development of H. armigera up to adult emergence, but there were significant differences in survival and development and fecundity on different diets. The highest larval survival was observed in the wheatgerm based diet in first (97.5%) and second generation (93.5%), followed by chickpea based modified diet (93.75% survival in both the genera...
2018
The present study was conducted to evaluate the comparative effect of natural diets and semi synthetics diet on Helicoverpa armigera (Hubner) in development and growth index. Among all the six different diets on the growth and development of the larvae of gram pod borer (H. armigera), The artificial diets (chickpea flour based diets) to be the most suitable which resulted longer larval period, pre-pupal period, pupal period. Maximum percent adult emergence, highest fecundity, sex ratio, growth index, pupal index, survival index and ovipositional index along with success index of different stage of H. armigera compared to the main diets of chickpea, mungbean and urdbean leaves and pods (control).
2006
Host plant resistance is one of the components for minimizing the damage by the noctuid pod borer, Helicoverpa armigera in chickpea. However, due to variations in H. armigera infestations in space and time, it becomes difficult to evaluate the test material in under natural infestation. Therefore, we evaluated the diet impregnation assay to evaluate chickpea genotypes for resistance to H. armigera. Ten-day old larvae weighed highest on the standard diet, followed by those reared on diets with leaf powder of the susceptible checks, ICC 4918 and ICCC 37. Larval weights were significantly lower in larvae reared on the leaves/pods of ICC 12476, ICC 12477, ICC 12478, ICC 12479 and ICCV 2 as compared to those reared on the susceptible check, ICC 12426. The larvae reared on artificial diet impregnated with lyophilized leaf and/or pod powder of ICC 12475, ICC 12476, ICCV 2, and ICC 12479 also weighed significantly lower than those fed on diets with ICC 12426, and ICC 3137. Of these, larval ...
Biology of Helicoverpa armigera (Hubner) Reared in Laboratory on Natural Diet
Pakistan Journal of Biological Sciences, 2000
Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) completed its larval stage in 17.325±0.326 days passing through six instars under laboratory protocol, 26±1EC, 60-70% RH and 16 hours' daylight. The larvae moulted for 2nd instar, two days after hatching from eggs. Average stadiel periods for 2nd, 3rd, 4th, 5th and 6th instars were 2.07, 2.15, 2.48, 3.12, 3.55 and 3.95 days respectively. The last larval stage did not moult but was contracted and shortened into grub like pre-pupal stage. The average length measured for each instar (first to sixth) was 3.4, 4.6, 9.7, 17, 28.35, 36.85 mm respectively. The average pupal period was 13.2 days for female and 15.4 days for male. Fecundity of moths fed on sucrose solution was significantly higher than water fed females. The unfed females laid few eggs none was viable.
Life table studies of Helicoverpa armigera (Hubner) on chickpea
International Journal of Plant Protection, 2009
Accepted : February, 2009 Chickpea (Cicer arietinum L.) is an important rabi season pulse crop of India occupying about 6.93 million ha with average productivity of 808 kg/ha (Anonymous, 2006). Of various insect pests of chickpea, gram pod borer, Helicoverpa armigera (Hubner) poses a serious problem for chickpea growers and is a limiting factor in its production. A reduction in yield ranging from 40-50 per cent has been reported and may cause even total loss of the crop (Rai et al., 2003). Till recently, chemical pesticides have been used for controlling H. armigera, but despite such a use, the pest could not be brought under control and causing harmful effect on beneficial organisms and thus responsible for ecological disturbances. Life tables are the most important tools in the pest management, which reveal the most opportune periods and vulnerable stage of the insects in the life cycle. Such ecological life tables record a series of sequential measurements that indicate populatio...
Stage specific lifetable of Helicoverpa armigera (hubner) on chickpea
Indian journal of entomology, 2012
Lifetable studies of Helicoverpa armigera (Hubner) carried out on chickpea under laboratory condition revealed that high mortality was observed at egg, 1st instar and pupal stages which indicated minimum survival fraction at these stages and maximum at 4th and 6th larval instars. The potential fecundity, doubling time and net reproductive rate was recorded more in 2nd generation than that of 1st generation. The mean generation time ranged from 31.98 to 36.63 days. The intrinsic rate of increase was examined to be 0.1236 females/female/day, repetitively in both the generations. Moreover, the 1st generation recorded higher values for the finite, intrinsic and annual rate of increase of population in comparison to 2nd generation.