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Title: Seasonal incidence of black scale, Saissetia oleae (Olivier) on the fern, Thelypteris tylodes (Kunze) from western Himalaya
Authors: Reddy, SG Eswara
Kumari, Alka
Keywords: Insect-fern interaction;Population dynamics
Issue Date: Jan-2019
Publisher: NISCAIR-CSIR, India
Abstract: Incidence of insect pests on ferns, particularly sap suckers, needs attention as it causes more damage indirectly. Here, we recorded seasonal incidence of black scale, Saissetia oleae (Olivier) on Thelypteris tylodes (Kunze) (Thelypteridaceae) for a period of one year from May 2012 to April 2013 at weekly interval. Results have shown that incidence of S. oleae first occurs in the first week of May 2012 (5.4 scales/rachis).The infestation increases gradually from second week of May (6.6 scales/rachis) and attains its peak during the last week of July 2012 (27.8 scales/rachis) due to high temperature (20–27°) and relative humidity (74-83%). The infestation starts declining gradually from August 2012 to November 2012 (24.7 scales/rachis to 3.4 scales/rachis). The lowest scale incidence was observed during the last week of December 2012 (0.50 scales/ rachis) and second week of January 2013 (0.2 scales/rachis). The scale infestation was not observed from third week of January 2013 to entire March 2013. The incidences of scale infestation during the period of observation have shown to be significant linear positive correlation with temperature, relative humidity and rainfall.
Page(s): 59-62
ISSN: 0975-1009 (Online); 0019-5189 (Print)
Appears in Collections:IJEB Vol.57(01) [January 2019]

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