Effect of selected bio-insecticides and intercropping systems of faba been and onion with sugarbeet major insects, quality and yield of sugarbeet [electronic resource].

Includes references.

The present study was carried out at Farm of Nobaryia Research Station, Agricultural Research Center at El Beheira, Governorate, Egypt in two successive seasons of 2011112and 2012113 to study the effect of intercropping sugarbeet (Beta vulgaris) cv. Gloria which intercropped with Faba been ( Vicia Faba,L) cv. Giza 3 and Onion (Allium cepa L) cv. Giza 20 and selected bio-insecticides comparing with chemical insecticide Selecron® on population density of tortoise beetle and beet fly (Cassida vittata and Pegomyia mixta) on sugarbeet plants. The population density of two major insect significantly decreased by different intercropping system in comparison with pure stand sugarbeet system. The intercropping system of (onion in 2 rows with sugarbeet) was less attractive to tortoise beetle, C. vittata (260. 73 and 240.93 Larvae& adults 10/plants) through the first and second season under study, respectively. The pure stand of sugarbeet system was more sensitive to infested by C. vittata (350.33& 480.07 Larvae and adults 10/plnts) during 1st and 2nd seasons, there different significant between intercropping systems except between intercropping (onion in 2 rows with sugarbeet) and (onion in 3 rows with sugarbeet) in the first seasons. Population density of beet fly, P. mixta was significantly affected by intercropping systems where, pure stand of sugarbeet system was recorded the highest numbers of larvae of beet fly (510. 7 and 600.27 larvae 110 plants) during 1st and 2nd seasons, respectively. In the opposition direction, the lowest values of rate infection by P. mixta was recorded (360.40 and 350.42 larvae 110 plants) with intercropping system (Faba been in three rows with sugarbeet). The roots and sugar yields were significantly affected by different intercropping system in both seasons and combined analysis. Yields were significantly decreased by all tested intercropping system in 1st and 2nd seasons and combined analysis as compared with pure stand system of sugarbeet. The highest values of this parameter with an average of 24.21, 25.29and 24.75 tons fect1 tor root yields and 3.81, 3.97 and 3.89 tons fed -1 for sugar yield in 1st and 2nd seasons and combined analysis, respectively. Among the different intercropping systems under study , intercropping faba been in two rows with sugarbeet achieved the highest roots yield (23. 19, 2. 75and 23.47 tons fect1) and sugar yield 3.81 tons fed-1 ) in 1st and 2nd seasons and combined analysis. The quality characters of sugarbeet, T.S.S. % and purity % were significantly affected by intercropping systems in both seasons and combined analysis but there were non significant effect in the second season for sucrose% characters. Percentage mortality of Cassida vittata and Pegomyia mixta affected by pesticides type and post treatment period~ chemical insecticides, Selecron® 72% EC and bio-insecticides Protecto ®, Dipel 2X® Bioranza® and Biofly® at recommended rates®. The results indicated that chemical insecticides, Selecron® 72% w as most potent against two major sugarbeet insects at all treatment period followed by Biofly® , Bioranza®, Dipel 2X® and Protecto. The fungal insecticides were most effective against the C. vittata and P. mixta than bacterial insecticides in sugarbeet production. The infestation rats by tortoise beetle C. vittata and beet fly P. mixta were significantly affected by the interaction between intercropping system and tested insecticides in the first and second seasons. The lowest infestation rate by tortoise beetle (220 larvae and adults 11 Oplants) and beet fly (277 larvae 101 plants) on sugarbeet system and bio-insecticides recorded with Selecron 72% x intercropping onion in two rows with sugarbeet system and Bioranza x intercropping faba been in two rows with sugarbeet system in the 2nd season. The roots yield, leaves yield and sugar yield of sugarbeet were significantly affected by the interaction between intercropping system and tested insecticides in both seasons. The highest roots yield (25.6 tons fed- 1) was obtained by Selecron x intercropping faba been in two rows or onion in three rows with sugarbeet system in the first and second season. The highest values of TS.S. % (22.33 %) was obtained with Se/ecron x intercropping faba been in two rows with sugarbeet in the second season and the lowest value (16. 60%) with Protecto ®x intercropping faba been in two rows with sugarbeet in the first season. The purity% significantly affected by interaction between tested insecticides and intercropping system. Finally, from results of this study , it can be conducted that fungal insecticides are the most effective than bacterial insecticides and intercropping sugarbeet with faba been in two and/or three rows decreased the rat infestation by Torloise beetle, Cassida vittata and Beet fly, Pegomyia. Mixta as major insect pest and produced the highest values of total income return compared to a sugarbeet monoculture.

Summary in Arabic.

1