Author(s): G.S. Solangi | G.M. Mahar | F.C. Oad
Journal: Journal of Entomology
ISSN 1812-5670
Volume: 5;
Issue: 1;
Start page: 31;
Date: 2008;
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Keywords: predator population | thrips | jassids | whitefly | insects | sucking | IPM | Cotton | temperature
ABSTRACT
-1) was observed in first week of the September at relative mean temperature 32.60C, however the maximum population of thrips (29.96 plant-1) and jassids (3.93 plant-1) was found in last week of the August at relative mean temperature 32.88C. The maximum overall means of whitefly in various observation days were observed (15.90 plant-1), followed by thrips (14.30 plant-1) and jassid (2.08 plant-1). The predator population of Green Lacewing, Chrysoperla carnea, Big eyed bug, Geocoris punctipes linearly increased but the population of Pirate bug, Orius insidiosus decreased in the last week of August at relative mean temperature 32.88C. The maximum overall means of Green Lacewing in various observation days was 2.07 plant-1), followed by Pirate bug (1.84 plant-1) and Big eyed bug (1.28 plant-1). The results indicated that the sucking insect pests were below the economic injury level at all phenological stages of the cotton plant due to the regular increase in predator population. The predators were active throughout the cotton season due to non-application of pesticides in and around the experimental area. The correlation coefficient (R = 0.563) showed a positive relationship between insect predators and sucking insect pest population. The increase in sucking insect population also exhibited an increase in predator population in observed days and trend line shows increase in insect predator population with sucking insect pest population during the growth stages of cotton crop.]]>
Journal: Journal of Entomology
ISSN 1812-5670
Volume: 5;
Issue: 1;
Start page: 31;
Date: 2008;
VIEW PDF
DOWNLOAD PDF Original pageKeywords: predator population | thrips | jassids | whitefly | insects | sucking | IPM | Cotton | temperature
ABSTRACT
-1) was observed in first week of the September at relative mean temperature 32.60C, however the maximum population of thrips (29.96 plant-1) and jassids (3.93 plant-1) was found in last week of the August at relative mean temperature 32.88C. The maximum overall means of whitefly in various observation days were observed (15.90 plant-1), followed by thrips (14.30 plant-1) and jassid (2.08 plant-1). The predator population of Green Lacewing, Chrysoperla carnea, Big eyed bug, Geocoris punctipes linearly increased but the population of Pirate bug, Orius insidiosus decreased in the last week of August at relative mean temperature 32.88C. The maximum overall means of Green Lacewing in various observation days was 2.07 plant-1), followed by Pirate bug (1.84 plant-1) and Big eyed bug (1.28 plant-1). The results indicated that the sucking insect pests were below the economic injury level at all phenological stages of the cotton plant due to the regular increase in predator population. The predators were active throughout the cotton season due to non-application of pesticides in and around the experimental area. The correlation coefficient (R = 0.563) showed a positive relationship between insect predators and sucking insect pest population. The increase in sucking insect population also exhibited an increase in predator population in observed days and trend line shows increase in insect predator population with sucking insect pest population during the growth stages of cotton crop.]]>
