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Abstract
The present studies includes were conducted to study the effect of planting distances (5, 10 and 15 cm.), intercropping with onion plants and garlic varieties on the population of Thrips tabaci on onion plants during two successive seasons (2017 /2018 and 2018 / 2019) in Assiut Governorate, Egypt, using the two garlic varieties (Egyptian and Chinese). Results indicated that the three mentioned variables have significant effect on the population of the pest. The plant distances were the most significant factor, with the high numbers of thrips closest spacing (5 cm.) between plants. Intercropped garlic with onion showed that the garlic harbored lowest number of the pest whereas; in onion solo the density of pest is high compared with intercropped with garlic. Onion with garlic Egyptian variety is lower infested than the onion with garlic Chinese variety one. It was also noticed that the highest yield of onions was given when the distance between plants was (10 cm.) and loading onions with garlic resulted in a lower yield than onions grown separately during the two seasons. Keywords: Onion, garlic, planting distances, intercropping with garlic varieties, Thrips tabaci , population, yield.
Highlights
In Egypt, onion (Allium cepa L.) is an important field crop for local consumption and exportation
Onion thrips T. tabaci is one of the main insect pests infesting onion crops causing severe damage by it always reduces the yield (El-Sherif, 1971) and (Shoeib and Hosny, 1972) in Egypt reported that T. tabaci was the major insect pest attacking onion plants
The second experiment used for study the effect of intercropping of onion plants with garlic varieties (1 : 1, onion : garlic Egyptian and Chinese varieties alternate rows compared with sole onion)
Summary
In Egypt, onion (Allium cepa L.) is an important field crop for local consumption and exportation. E. planting distances of onion, intercropping with two garlic varieties) on the population density of T. tabaci on onion plants during the two successive seasons were presented as follows: 1.
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