DAMAGE LOSS ASSESSMENTS AND ECONOMIC DESCISON LEVELS OF TROPINOTA SQUALIDA SCOP. ADULTS POPULATION. (COLEOPTERA: SCARABAIDAE)
SHERIEF, E., EL-DEEB, M., EL-ZOHAIRY, M., DESUKY, W. (2003). DAMAGE LOSS ASSESSMENTS AND ECONOMIC DESCISON LEVELS OF TROPINOTA SQUALIDA SCOP. ADULTS POPULATION. (COLEOPTERA: SCARABAIDAE). EKB Journal Management System, 81(2), 467-489. doi: 10.21608/ejar.2003.276550
ELSAYED A. H. SHERIEF; MOHAMED A. EL-DEEB; MANSOUR M. M. EL-ZOHAIRY; WAHED M. H. DESUKY. "DAMAGE LOSS ASSESSMENTS AND ECONOMIC DESCISON LEVELS OF TROPINOTA SQUALIDA SCOP. ADULTS POPULATION. (COLEOPTERA: SCARABAIDAE)". EKB Journal Management System, 81, 2, 2003, 467-489. doi: 10.21608/ejar.2003.276550
SHERIEF, E., EL-DEEB, M., EL-ZOHAIRY, M., DESUKY, W. (2003). 'DAMAGE LOSS ASSESSMENTS AND ECONOMIC DESCISON LEVELS OF TROPINOTA SQUALIDA SCOP. ADULTS POPULATION. (COLEOPTERA: SCARABAIDAE)', EKB Journal Management System, 81(2), pp. 467-489. doi: 10.21608/ejar.2003.276550
SHERIEF, E., EL-DEEB, M., EL-ZOHAIRY, M., DESUKY, W. DAMAGE LOSS ASSESSMENTS AND ECONOMIC DESCISON LEVELS OF TROPINOTA SQUALIDA SCOP. ADULTS POPULATION. (COLEOPTERA: SCARABAIDAE). EKB Journal Management System, 2003; 81(2): 467-489. doi: 10.21608/ejar.2003.276550

DAMAGE LOSS ASSESSMENTS AND ECONOMIC DESCISON LEVELS OF TROPINOTA SQUALIDA SCOP. ADULTS POPULATION. (COLEOPTERA: SCARABAIDAE)

Egyptian Journal of Agricultural Research
Article 4, Volume 81, Issue 2, July 2003, Page 467-489  XML PDF (5.63 MB)
Document Type: Original Article
DOI: 10.21608/ejar.2003.276550
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Authors
ELSAYED A. H. SHERIEF1; MOHAMED A. EL-DEEB2; MANSOUR M. M. EL-ZOHAIRY2; WAHED M. H. DESUKY1
1Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt
2Faculty of Agriculture, Zagazig University, Egypt
Abstract
In the Arab Republic of Egypt, many insect pests attack both fruit trees and field crops in newly reclaimed areas. Family Scarabaeidae com­prises several representative species more or less injurious to agricul­ture. In recent years. the population of Tropinota sucalWa Scop. increas­ing greatly causing great damage to various plantations. Percentage of damaged flowers, average number of adults/plant and their relations. with yield of each host, on apple, pear, navel orange. and broad bean have been estimated. The average percentage of infested flowers of apple during four seasons was 19.10%, when percentage of infestation reached 22.8%. a significanfdrop in yield occurred; the level (22%) could be considered as economic damage threshold level. For 1996 a number of 25.2 adults/ tree decreased the yield to 13.2 kgAree, while only 13 adults/tree was achieved for 1995, 15.20 kg/tree. The average percentage of infested pear flowers for the four sea­sons combined was 20.8%. then causing corresponding damage when it was 27.6%, a significant drop in the yield occurred. The level (27%) could be considered as economic damage threshold (E.0.7). The maxi­mum 21.4 number of infested adults/tree during 1994 decreased the yield to 152.7 kg/tree, while the minimum of number 12.9 adults/tree occurred during 1995 increased the yield average to 156.1 kg/tree. The average percentage of infested navel orange flowers during the four seasons was 17.53%, when it reached 22.2%, a significant drop in yield occurred, the level (17.2%) could be considered as damage threshold. The damage threshold of number of insects/m2/tree ranged between 0.73 to 0.80 beetles/ma/tree. The sowing dates of first season of broad been harbored higher infestation level than those of the second one. The percentage of infes­tations were 22.8% and 12.55%. respectively. The emerged flowers of the second sowing date (Oct. 15 for both seasons were subjected to more higher infestation (20.4%) than flowers emerged in other sowing dates. Up to 11.8% percentage of infestation can be considered as dam-
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