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Murali Mohan, K.
- Effect of Potassium and Zinc Deficiencies on Growth Parameters of Gerbera under Polyhouse Condition
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Authors
Affiliations
1 Division of Soil Science and Agricultural Chemistry, College of Agriculture, Pune (M.S.), IN
1 Division of Soil Science and Agricultural Chemistry, College of Agriculture, Pune (M.S.), IN
Source
The Asian Journal of Horticulture, Vol 10, No 2 (2015), Pagination: 267-271Abstract
The results of the experiment revealed that K and Zn deficient treatments showed significantly inferior results in respect to growth parameters viz., number of suckers per plant, number of leaves per plant, plant height and plant spread. The K and Zn deficient treatments showed significantly inferior results in respect to quality parameters viz., height of flower stalk, flower diameter, green and dry weight of individual flower, vase life of flower, number of flower per plant and more number of days required for flower maturity over all nutrients application treatments. The significant reduction in yield of gerbera, green and dry matter production per plant, nutrient content and nutrient uptake observed due to the K and Zn deficient treatment. The K deficient treatments showed marginal necrosis of leaves and flowers became pale, which are the typical symptoms. The Zn deficient treatments showed formation of smaller sized thicker leaves which caused rosette formation and interveinal chlorosis of leaves with green spots at somewhere which are typical symptoms.
Keywords
Potassium, Zinc, Deficiency, Growth, Gerbera, Polyhouse.
- Behavioural Response of Specific Larval Endoparasitoid, Apanteles machaeralis (Wilkinson) to Volatile Cues from its Host Insect, Diaphania indica (Saunders) and the Host Plant (Cucumis sativus L.)
Abstract Views :240 |
PDF Views:120
Authors
Affiliations
1 Department of Entomology, University of Agricultural Sciences, Bangalore – 560065, Karnataka, IN
2 Division of Entomology and Nematology, ICAR-Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bangalore – 560089, Karnataka, IN
1 Department of Entomology, University of Agricultural Sciences, Bangalore – 560065, Karnataka, IN
2 Division of Entomology and Nematology, ICAR-Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bangalore – 560089, Karnataka, IN
Source
Journal of Biological Control, Vol 34, No 2 (2020), Pagination: 132-139Abstract
Apanteles machaeralis (Wilkinson), a braconid specialist larval endoparasitoid of Diaphania indica occurs naturally causing significant levels of parasitism. The present study explores the response of the A. machaeralis to odour cues from D. indica damaged cucumber plant as well as host larvae. Different odour treatments namely, D. indica larval body volatiles (T1), volatiles from larval excreta (T2), volatiles from larvae + excreta (T3), volatiles from D. indica body wash (T4), volatiles from the healthy, mechanically damaged and D. indica infested cucumber plants (HIPVs) were collected using headspace analysis and the response of female A. machaeralis was studied using olfactometer assays. Results of the study conclusively indicated that A. machaeralis is highly attracted to host larval body wash as parasitic wasps spent significantly more time made more entries into the treated region in single as well as dual choice assays. The electoantennographic response (EAG) further supported the olfactometer bioassays. The GC-MS analysis revealed significant differences in the volatile emissions of different treatments studied. The utilization of host insect body cues and HIPVs in the host recognition by the specialist endoparasitoid A. machaeralis is discussed in detail.Keywords
Cucumber Moth, HIPVs, Olfactometer Assays, Specialist Parasitoid, Volatiles.Full Text
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