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Bioecology and management of Helopeltis antonii signoret (hemipetra: miride) on Cashew in coastal karnataka

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Title Bioecology and management of Helopeltis antonii signoret (hemipetra: miride) on Cashew in coastal karnataka
 
Creator C, Manja Naik
 
Contributor A. K, Chakravarthy
 
Subject nuts, developmental stages, eggs, biological phenomena, bugs, tea (plant), animal developmental stages, biological interaction, helopeltis antonii, planting
 
Description Investigations on the Bio-ecology and management of Helopletis antonii Signoret
(Hemiptera : Miridae) on cashew in coastal Karnataka, were conducted during 2006 to
2008. The tea mosquito bug infesting cashew in coastal and maidan Karnataka was
identified as Helopeltis antonii Signoret. There was no co-existence of other species of
Helopeltis in these regions. The gravid female preferred to oviposit on the young shoots,
inflorescence stalk and developing cashew nuts. Mean incubation period ranged between
7.20 to 7.80 days in laboratory. The least developmental period of 25.0 days (egg to
adult) was recorded in October-November and longer duration of 30.40 days in
December –January. Sex ratio female to male was 1.0 : 0.80. TMB completed twelve
generations in a year. Variance to mean ratio higher than 1 indicated the aggregation
distribution, coinciding with the emergence of new flush, panicle and nut and fruit
developmental period. Variance to mean values nearing to 1 projected the random
distribution of the bugs on cashew trees. TMB egg parasitoid Telenomus sp. recorded
16.20 and 15.45 per cent parasitisation from the host eggs collected in Brahmavar and
Pethri cashew plantations. Cashew varieties Ullal-1, V.R.I-3, V-7, 9/25-Neeleshwar,
1/40-Palaparamba, 2/97-Kottarakara and Priyadarshini were found promising against
TMB. The cashew trees fully colonized by O.smaragdina exhibited the least per cent
damage 11.40 + 1.87 and 8.71 + 1.23 during 2006 - 2008 in coastal and maidan
Karnataka, respectively. The fecundity of TMB released on host plant treated with λ-
cyhalothrin (0.005%), carbaryl (0.10%), monocrotophos (0.05%) and endosulfan (0.05%)
was least 1.04, 1.12, 0.82 and 1.09 respectively, on 0 DAT. Pruned cashew trees attracted
more number of adult bugs 9.63 / tree and it was least 3.0 adult/ tree on unpruned trees.
Sequential sprays of monocrotophos (0.05) + λ-cyhalothrin (0.005) + carbaryl (0.10) at
new flush, panicle and nut and fruit developmental stages were found effective and
recorded higher nut yield of 1113.94 kg / ha and C : B ratio of 1 : 17.03.
 
Date 2016-05-28T09:44:47Z
2016-05-28T09:44:47Z
2011-11-18
 
Type Thesis
 
Identifier Th-9579
http://krishikosh.egranth.ac.in/handle/1/66419
 
Language en
 
Format application/pdf
 
Publisher University of Agricultural Sciences, Bengaluru