Seasonal abundance of predatory bugs, Eocanthecona furcellata (Wolff.) and Rhynocoris fuscipes (F.) and its olfactory responses towards plant andpest mediated semiochemical cues in Pigeonpea ecosystem

2016 ◽  
Author(s):  
Snehel . Chakravarty ◽  
Meena . Agnihotri ◽  
Jaba . Jagdish
Keyword(s):  
Insect Pests ◽  
Seasonal Abundance ◽  
Maximum Temperature ◽  
Olfactory Responses ◽  
Minimum Relative Humidity ◽  
Host Seeking ◽  
Eocanthecona Furcellata ◽  
Seeking Behavior ◽  
Predatory Bugs ◽  
Early Instar

Studies on seasonal abundance of the predatory bugs, Eocanthecona furcellata (Wolff.) and Rhynocoris fuscipes (F.) on short duration pigeonpea variety Manak during 2012-14 revealed that the incidence of both the heteropteran bugs commenced from the 36th meteorological standard week and persisted up to 47th meteorological standard week of both the years. These bugs were found predating on larvae of spotted pod borer, Maruca vitrata (Geyer), one of the major insect pests of pigeonpea. Correlation studies with different weather variables indicated that the populations build up of these bugs exhibited a significant positive correlation with maximum temperature, minimum relative humidity and rainfall. In order to identify the semiochemical cues mediating the host seeking behavior of these predatory bugs towards M. vitrata, a laboratory experiment was conducted using four-arm olfactometer. The predatory bugs displayed a much higher preference for volatiles produced by M. vitrata infested pigeonpea flowers and early instar larvae of M. vitrata.

Seasonal abundance of Campoletis chlorideae Uchida (Hymenoptera:Ichneumonidae), A larval parasitoid of Helicoverpa armigera(Hubner) hardwick in chickpea

2016 ◽  
Vol 39 (4) ◽  
Author(s):  
A. Kuzhandhaivel Pillai ◽  
S. Selvaraj ◽  
Meena Agnihotri
Keyword(s):  
Climate Change ◽  
Relative Humidity ◽  
Significant Negative Correlation ◽  
Seasonal Abundance ◽  
Maximum Temperature ◽  
Weather Factors ◽  
Campoletis Chlorideae ◽  
Minimum Relative Humidity ◽  
Larval Parasitoid ◽  
Survival And Development

Climate change is likely to affect the insect host and the activity and abundance of biological control agents. Therefore, the present studies were conducted to understand the seasonal abundance of larval parasitoid, Campoletis chlorideae on chickpea at Pantnagar during the cropping season 2010-11 and 2011-12 revealed that the larval parasitoid exhibited its marked first appearance in 3rd standard meteorological week (SMW) and attained peak population in 7th (85.80%) and 8th (87.65%) SMW, respectively. Statistical analysis between the weather parameters and the population of the larval parasitoid showed a significant negative correlation with maximum temperature (r= - 0.698* and r= - 0.705*) and minimum temperature (r= - 0.706* and r= - 0.790*) whereas significant positive correlation with maximum relative humidity (r= 0.800** and r = 0.824**) and minimum relative humidity (r= 0.636* and r= 0.254) during 2010-11 and 2011-12, respectively. The results indicated that changes in weather factors as a result of climate change would have considerable influence on survival and development of C.chlorideae.

scholarly journals Studies on population dynamics of major pests of Ailanthus excelsa Roxb

2021 ◽  
Vol 42 (4(SI)) ◽  
pp. 1168-1173
Author(s):  
V. Manimaran ◽  
◽  
M. Suganthy ◽  
A. Balasubramanian ◽  
P. Pretheepkumar ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Insect Pests ◽  
Seasonal Abundance ◽  
Maximum Temperature ◽  
Pest Population ◽  
Peak Period ◽  
Ailanthus Excelsa ◽  
Major Pest ◽  
Weather Parameters ◽  
R Value

Aim: To study the peak period of incidence of major pest of Ailanthus excelsa. Methodology: Seasonal abundance of major insect pests of A. excelsa viz., ailanthus defoliator and ailanthus webworm were studied in 5-year-old plantation at Forest College and Research Institute, Mettupalayam from April, 2018 to March, 2019. Weekly observations were made on the abundance of major insect and pest population which were correlated with weekly weather parameters. Results: Monitoring the population dynamics of insect pests revealed that the major key pests were ailanthus defoliator and webworm. The highest number of ailanthus defoliator (38.00 larvae per tree) and webworm (33.90 larvae per tree) were recorded during 44th standard week in 5-year-old plantation. Correlation analysis revealed that maximum temperature (Tmax) was negatively correlated with ailanthus defoliator with the r value of -0.299. Regarding webworm, wind velocity and evaporation rate were negatively correlated with the r value of -0.412 and -0.361 and was found to be statistically significant at 1% level. Interpretation: Seasonal abundance of this information helps us to take decision for the management of A. excelsa pests.

scholarly journals Influence of pyrethroïd-treated bed net on host seeking behavior of Anopheles gambiae s.s. carrying the kdr allele

PLoS ONE ◽  
2017 ◽  
Vol 12 (7) ◽  
pp. e0164518 ◽  
Author(s):  
Angélique Porciani ◽  
Malal Diop ◽  
Nicolas Moiroux ◽  
Tatiana Kadoke-Lambi ◽  
Anna Cohuet ◽  
...  
Keyword(s):  
Anopheles Gambiae ◽  
Bed Net ◽  
Anopheles Gambiae S.S ◽  
Host Seeking ◽  
Seeking Behavior

Seasonal Incidence of Major Sternorrhynchan Insect Pests Infesting Arecanut In South India

2021 ◽  
Vol 27 (1) ◽  
Author(s):  
Vinod Kumar Dubey ◽  
C.M. Kalleshwaraswamy ◽  
B.K. Shivanna
Keyword(s):  
South India ◽  
Field Experiments ◽  
Insect Pests ◽  
Transitional Zone ◽  
Maximum Temperature ◽  
Seasonal Incidence ◽  
Correlation Studies ◽  
Pseudococcus Longispinus ◽  
Sunshine Hours ◽  
Chrysomphalus Aonidum

Field experiments were conducted during 2019-20 to know the seasonal incidence of three species of sternorrhynchan insect pests infesting in arecanut viz., whitefly, Aleurocanthus arecae, armoured scale, Chrysomphalus aonidum and mealybug, Pseudococcus longispinus in two different locations under southern transitional zone. The study revealed that, all the three species infesting arecanut were active throughout the year. Correlation studies of whiteflies showed that, rainfall was significantly positively correlated and maximum temperature and sunshine hours were significantly negatively correlated. For armoured scales, non-significant positive correlation with minimum temperature and for the mealybug resulted that the maximum temperature was significantly positively correlated whereas the relative humidity was significantly negatively correlated.

scholarly journals Impact of abiotic factors on build-up of citrus psylla, Diaphorina citri Kuwayama population in Punjab, India

2014 ◽  
Vol 6 (2) ◽  
pp. 371-376 ◽  
Author(s):  
Hijam S. Devi ◽  
D. R. Sharma
Keyword(s):  
Relative Humidity ◽  
Disease Transmission ◽  
Minimum Temperature ◽  
Abiotic Factors ◽  
Winter Season ◽  
Seasonal Abundance ◽  
Maximum Temperature ◽  
Weak Links ◽  
Diaphorina Citri ◽  
Citrus Psylla

Seasonal abundance of citrus psylla (Diaphorina citri) Kuwayama was studied on Kinnow mandarin under Punjab conditions during 2012 and 2013. Population of D. citri was present throughout the year but only adults found surviving during December and February. There was no nymphal population when maximum temperature was > 39°C or < 7°C. Two population peaks of nymphs wer e observed, first in April-May and second in August- September. Thereafter, there was abrupt decline in nymphal population during June and July during both the years when the weather conditions i.e. maximum, minimum temperature (°C), relative humidity (%), rainfall (m m) and sunshine (hrs) ranged from 24.4-44, 22.4-31.8, 25.5-100, 0-108.0 and 0-13.5, respectively. Highest peaks of adult were found during May followed by June. With the decrease in temperature from the end of September, the population of D. citri started to decrease and reached its lowest during winter season. Correlation analysis for both the years indicated that maximum and minimum temperature, sunshine and rainfall were positively correlated with nymphal, adult and mixed population but the effect of rainfall on adult population was non-significant, while relative humidity was negatively correlated. The study is useful to find out the weak links of psyllid populations in relation to abiotic factors and that could be exploited to curb its infestation and disease transmission.

Study on host-seeking behavior and chemotaxis of entomopathogenic nematodes using Pluronic F-127 gel

2019 ◽  
Vol 161 ◽  
pp. 54-60 ◽  
Author(s):  
Chunjie Li ◽  
Xianhong Zhou ◽  
Edwin E. Lewis ◽  
Yi Yu ◽  
Congli Wang
Keyword(s):  
Entomopathogenic Nematodes ◽  
Host Seeking ◽  
Seeking Behavior

scholarly journals Effect of Dinotefuran, Permethrin, and Pyriproxyfen (Vectra® 3D) on the Foraging and Blood-Feeding Behaviors of Aedes albopictus Using Laboratory Rodent Model

Insects ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 507
Author(s):  
Younes Laidoudi ◽  
Djamel Tahir ◽  
Hacène Medkour ◽  
Marie Varloud ◽  
Oleg Mediannikov ◽  
...  
Keyword(s):  
Aedes Albopictus ◽  
Selection Index ◽  
Exposure Period ◽  
Blood Feeding ◽  
Feeding Behaviors ◽  
Host Seeking ◽  
Seeking Behavior ◽  
Feeding Effect ◽  
Rats And Mice ◽  
And Control

Dinotefuran-Permethrin-Pyriproxyfen (DPP) is used to kill and repel mosquitoes from dogs. However, the influence of the product on the host-seeking behavior of mosquitoes remains unknown. The interference of DPP with the host selection of unfed female Aedes albopictus was investigated. A total of 18 animals (9 mice and 9 rats) were divided into three groups of six animals each. DU: DPP treated rats (n = 3) with untreated mice (n = 3), UD: DPP treated mice (n = 3) with untreated rats (n = 3) and control UU: untreated mice (n = 3) and untreated rats (n = 3). In each group, the rats and mice were placed 30 cm apart. After sedation, the animals in each group were exposed twice (Day 1 and Day 7 post-treatment) for one hour to 71 ± 3 female mosquitoes. Mosquitoes were categorized after the 2-h post-exposure period as dead or alive. Blood-meal origin was determined from mosquitoes using a newly customized duplex qPCR. The highest values of forage ratio (1.36 ≥ wi ≤ 1.88) and selection index (0.63 ≥ Bi ≤ 0.94) for rat hosts indicates a preference of mosquitoes for this species as compared to mice when co-housed during the exposure. The mosquitoes only seldom fed on mice, even in the untreated group. The anti-feeding effect of DPP was therefore only assessed on rat’s hosts. The results showed that DPP, when directly applied on rats, provided a direct protection of 82% and 61% on Day 1 and Day 7, respectively, while when applied on mice hosts (UD), the DPP provided an indirect protection of 21% and 10% on Day 1 and Day 7, respectively. The results showed also that DPP, when applied on rats, provided a direct protection against Ae. albopictus bites. This effect did not result in increased exposure of the untreated host placed in the same cage at a distance of 30 cm.

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