SHALABY, G., HENDAWY, A. (2007). LEAFHOPPERS AND THEIR ASSOCIATED PARASITOIDS IN SUGAR BEET FIELDS. Egyptian Journal of Agricultural Research, 85(3), 967-975. doi: 10.21608/ejar.2007.227249
GAMAL A SHALABY; AHMED S. HENDAWY. "LEAFHOPPERS AND THEIR ASSOCIATED PARASITOIDS IN SUGAR BEET FIELDS". Egyptian Journal of Agricultural Research, 85, 3, 2007, 967-975. doi: 10.21608/ejar.2007.227249
SHALABY, G., HENDAWY, A. (2007). 'LEAFHOPPERS AND THEIR ASSOCIATED PARASITOIDS IN SUGAR BEET FIELDS', Egyptian Journal of Agricultural Research, 85(3), pp. 967-975. doi: 10.21608/ejar.2007.227249
SHALABY, G., HENDAWY, A. LEAFHOPPERS AND THEIR ASSOCIATED PARASITOIDS IN SUGAR BEET FIELDS. Egyptian Journal of Agricultural Research, 2007; 85(3): 967-975. doi: 10.21608/ejar.2007.227249
LEAFHOPPERS AND THEIR ASSOCIATED PARASITOIDS IN SUGAR BEET FIELDS
1Plant Protection Department, Sugar Crops Research Institute, Agricultural Research Center, Giza, Egypt
2Biological Control Research Department, Plant Protection Research Institute, Agricultural Research Center, Giza, Egypt
Abstract
Sugar beet plants are subject to attack by many insects, of which are several species of leaftivppLis. Leafhoppers directly injure sugar beet plants by sucking large amounts of sap, and indirectly by transmitting virus diseases. Parasitoids of leathoppers infesting sugar beet plants have received little attention in Egypt. The current investigation was carried out at locations in Kafr El Sheikh and Gharbia Governorates, as well as at Sakha Agricultural Research Station during 2004/05 and 2005/06 seasons to survey paraskads of leafhopper eggs and nymphs. Also, the population fluctuations of the leafhopper, Emmen decipiens Paoli adults and the egg-parasitoid, Anagrus seq. were monitored. The survey of leafhoppers, using sweeping net and vacuum machine, revealed the occurrence of 13 species; Colana sp., Nephota& apicalis (Motsch.), Reolia sp., fralchrtha sop., Cicadulma brpunctata (Melichar), Macrosteres sp., Exit/anus capicola (Stal.), &SAW tenellus (Baker), Crosiers arbionaus Distant, Hecalus Empoasca cretin Park Empnara lybica de Berg and Asymmetrasca decedens (Paoli). Nymphs of Nephotettrk sp and Ocalukna sp. were found to be parasitized by Rpuncules sp. and Tomosvaryella sp.(Fipunculidae: Diptera). Five egg-parasitoids were detected from the host eggs of Empoasca deoprens, four species; Anagns sp., A. atomus Linnaeus, A. empoascae Dozier, EtythmcYus spare belonging to 'amity Minnaridae, and one species; Oligosita sp. belonging to family Tricogrammabdae. Population flactuabons of E. deopiens and its egg-parasitoid, Anagna spp. were monitored using yellow sticky traps at Kafr El-Sheikh and Gharbia locations. The insect pest exhibited four peaks of occurrence ( on 15 Oct., 15 Jan., 15 Mar and 1 May) accompanied by three peaks of the parasitoid ( on 1 Nw.,1 Feb and 1 Apr.). At Gharbia ocatlons, three peaks were detected for the insect pest ( on 15 Noy, 15 Mar. and 1 May) associated With two peaks for the parasitoid (on 1 Dec. and 1 Apr.). This study shows that sugar beet fields are rich in parasitoid species attaddng leafhoppers which are still minor pests in such reds. Consequently, too much restrictions should be imposed upon the application of insectiddes to conserve these important natural enemies, otherwise the minor pets could become major ones.
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