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Published By Association For Advancement Of Entomology

0377-9335

ENTOMON ◽  
2021 ◽  
Vol 46 (4) ◽  
pp. 279-284
Author(s):  
S. Barathy ◽  
T. Sivaruban ◽  
Srinivasan Pandiarajan ◽  
Isack Rajasekaran ◽  
M. Bernath Rosi

In the study on the diversity and community structure of Ephemeroptera in the freshwater stream of Chinnasuruli falls on Megamalai hills, a total of 523 specimens belonging to thirteen genera and five families were collected in six month periods. Of the five families, Teloganodidae and Leptophlebiidae exhibited high diversity and Caenidae showed low diversity. Choroterpes alagarensis (Leptophlebiidae) is the most dominant species. Diversity indices such as Shannon and Simpson indices showed that diversity was maximum in November and December and it was minimum in August and January. Canonical Correspondence Analysis revealed that rainfall, water flow, turbidity, and air temperature were the major stressors in affecting the Ephemeropteran community structure.


ENTOMON ◽  
2021 ◽  
Vol 46 (4) ◽  
pp. 357-360
Author(s):  
K. Karthika ◽  
K. Sunil Jose

Neoheterophrictus chimminiensis Sunil Jose, 2020 was previously only found in the Chimmini forest area, but it has recently been found in the Nelliyampathy forest region of Western Ghats, indicating its distribution. Taxonomic description illustrations and measurements of chimminiensis are added.


ENTOMON ◽  
2021 ◽  
Vol 46 (4) ◽  
pp. 333-336
Author(s):  
Keerthy Vijayan ◽  
R. Suganthasakthivel ◽  
T.V. Sajeev ◽  
Fred Naggs

The giant African snail Lissachatina fulica (Bowdich, 1822) is reported as a pest in rubber plantations adjoining forest fringes in the Western Ghats region of Kerala. The snail was causing damage to rubber (Hevea brasiliensis) and nutmeg (Myristica fragrans) trees, by feeding on rubber latex and nutmeg twigs and leaves. L. fulica infestation on M. fragrans is a new record. The snail infestation in rubber plantations is the first report from the Western Ghats region in Kerala.


ENTOMON ◽  
2021 ◽  
Vol 46 (4) ◽  
pp. 285-292
Author(s):  
V. Rajamannar ◽  
R. Govindarajan ◽  
R. Krishnamoorthi ◽  
Ashwani Kumar ◽  
P. Philip Samuel

The species composition and host preference of medically important fleas monitored in urban, semi-urban, and rural revealed 412(65%) and 222(35%) fleas. From urban and rural habitats 90 and 345 fleas were collected respectively. There was a significant difference between urban and rural habitats in flea abundance. From rodents and domestic animals 209 (33%) Xenopsylla cheopis, 203 (32%) X. astia and 222 (35%) Ctenocephalides felis fleas were recorded. Fleas were predominantly found on Rattus rattus 45(83.3%) and Canis familiaris 31(83.8%). Among the habitats, there was no significant difference in rodent flea positivity and dog/cat flea positivity.


ENTOMON ◽  
2021 ◽  
Vol 46 (4) ◽  
pp. 349-356
Author(s):  
Anupa K. Antony ◽  
Merin Elizabeth George ◽  
G. Prasad

Survey conducted on the ant diversity in the Kerala University Campus revealed a total 64 species under six subfamilies. Species belonging to the Myrmicinae dominated (51.5%) followed by Formicinae (20.6%), Ponerinae (13.2%), Dolichoderinae (4.4%), Pseudomyrmicinae (4.4%) and Dorylinae (1.5%). Endemic species Camponotus invidus Forel, 1892 , Cardiocondyla parvinoda Forel, 1902, Carebara spinata Bharti & Kumar, 2013 and Tetramorium rossi (Bolton, 1976) were recorded in the campus. Anoplolepis gracilipes (Smith, 1857), Paratrechina longicornis (Latreille, 1802), Monomorium carbonarium Smith 1858, Solenopsis geminate (Fabricius, 1804), Strumigenys membranifera Emery, 1869, Tetramorium bicarinatum (Nylander, 1846) and Hypoponera ragusai (Emery, 1894) (introduced species) were found in the campus. The results showed that the campus is rich in ant diversity. The sites with human interference showed less diversity. A potential new species in the genus Lepisiota was recorded. Trichomyrmex abberans, Carebara spinata, Crematogaster anthracina, Crematogaster biroi and Nylanderia indica are new records.


ENTOMON ◽  
2021 ◽  
Vol 46 (4) ◽  
pp. 343-348
Author(s):  
Manish K. Yadav ◽  
Lipsa Das ◽  
V. Ramalakshmi ◽  
Nihal R. Sunil ◽  
Sudhanshu Bala Nayak ◽  
...  

Investigation undertaken with eight chickpea genotypes (Vallabh Kallar Channa 1, Ankur (CSJ 140), JGK-2, Ganguar (GNG 1581), Jawahar Gram-1 (JGK 1), WCG-10 (Pant G-10), Avrodhi and ICC 506-EB as resistant check) for their morphological and biochemical traits of resistance to Helicoverpa armigera, indicated trichome number, length and density, and nitrogen, total chlorophyll and potassium content as influencing the resistance/ susceptibility levels in chick pea.


ENTOMON ◽  
2021 ◽  
Vol 46 (4) ◽  
pp. 337-342
Author(s):  
Medammal Zubair ◽  
Keethadath Arshad

Oxyrachis tarandus Fab. (Homoptera: Membracidae), commonly known as cow horn bug or treehopper was found heavily infested on rose apple (Syzygium aqueum (Burm.f.) Alston, Myrtaceae). Infestation caused wilting, defoliation and structural abnormalities of fruits in S. aqueum and was found in 81 patches within a tree, which is further divided into peduncle, PD (48 patches), young terminal branches, YTB (20), older twig, OT (13), main bark, MB (0) and leaf, L (0). Infestation of shoot length ranged from 3 to 25 cm comprising a surface area of 5.47 to 25.47 cm2. Population density of cow horn bug was significantly higher in PD compared to YTB and OT and peak infestation was noted during last week of March and first week of April. Prominent mutualism between O. tarandus and ant Oecophylla smaragdina was noted with strong positive correlation.


ENTOMON ◽  
2021 ◽  
Vol 46 (4) ◽  
pp. 325-332
Author(s):  
M. S. Sasi ◽  
R. Rajendran ◽  
V. Meenakshy ◽  
T. Suresh ◽  
R. Heera Pillai ◽  
...  

Zika virus (ZIKV) a mosquito-borne, causing acute febrile illness associated with rash, arthralgia and conjunctivitis in the patient, was reported from Thiruvananthapuram, Kerala, as an outbreak with 83 cases. Entomological surveillance revealed the presence of aedine mosquitoes viz., Aedes aegypti (Linnaeus, 1762), Ae. albopictus (Skuse, 1894) and Ae. vittatus (Bigot, 1861) and nonaedine mosquitoes viz., Anopheles stephensi Liston,1901, Mansonia uniformis (Theobald, 1901), Culex tritaeniorhynchus Giles, 1901 and Cx. gelidus Theobald,1901. Aedes (Ae. aegypti, Ae. vittatus and Ae. Albopictus) mosquito larvae were high in the Zika affected areas. Moreover ZIKV was detected in An. stephensi mosquitoes collected from Parassala, Thiruvananthapuram (the native place of the first ZIKV confirmed case in the present outbreak in Kerala). Molecular diagnostics of Ae. Aegypti, Ae. vittatu and An. stephensi mosquitoes revealed that the species were loaded with ZIKV. Significantly this is the first ever report of ZIKV detecting in An. stephensi in the world. Aedes adults (male and female) and An. stephensi emerged from fourth instar larvae and pupae were found to have ZIKV, indicating transovarial transmission of the virus.


ENTOMON ◽  
2021 ◽  
Vol 46 (4) ◽  
pp. 305-312
Author(s):  
S. Sahina ◽  
M.I. Zahir Hussain ◽  
R. Balasubramanain

A study was undertaken on the ovicidal and larval repellent activity of Tagetes erecta leaf and flower extracts on Rhipicephalus sanguineus (Latreille, 1806), an important tick species in the world from an economic and medical point of view. Ethanol and methanol extracted plant products tested against the eggs and larvae of R. sanguineus indicated that the ethanol extract of flower had maximum ovicidal activity (86.1%), followed by the ethanol extract of leaf (75%) at 25 mg ml-1 concentration. In all analyses, the homogeneity of variance was significant. The probit analysis clearly indicated that the ethanol extract of the flower has a higher ability to kill the eggs. In the case of larval repellency tested, both extracts of leaf showed the highest repellency (83%) at 2.5 mg ml-1. Significant tick repellency (> 90%) was found in both methanol and ethanol extracts of flower at 2.5 mg ml-1. GC-MS analysis of extracts revealed the presence of bioactive insecticidal compounds such as yangambin, cyclohexane and neophytadine.


ENTOMON ◽  
2021 ◽  
Vol 46 (4) ◽  
pp. 313-324
Author(s):  
Anupama Saha ◽  
Susmita Gupta

Structures on the legs of two hemipteran bugs, Micronecta haliploides (Horvath, 1904) and Hydrometra greeni (Kirkaldy, 1898), belonging to family Micronectidae and Hydrometridae of two infra orders Nepomorpha and Gerromorpha, respectively were investigated using scanning electron microscopy. Both species have a distinctive leg structure bearing specialised cuticular sensory structures. In the study, the sensilla were classified into five basic types: sensilla trichoidea, sensilla basiconidea, sensilla placoidea, porous circular sensilla and sensilla bell mouthed. These sensilla were further differentiated on the basis of shape, size, number, flexibility and type of socket attached. A total of 26 types of sensilla in the legs of these two species were observed. M. haliploides showed 18 types of sensory structures and H. greeni 8 types. A specific morphological structure of the porous circular sensilla was observed and found to be unique.


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