Pest resistant and tolerant crop varieties offer a major mean of pest control as it could be incorporated into integrated pest management programs to minimize the serious problems of insecticides. The current work was carried out at Sakha Agricultural Research Station Farm to evaluate the relative susceptibility of six soybean varieties (Crawford, Giza 21, Giza 22, Giza 111, H 30 and H 32) to infestation with the main piercing-sucking insects (whitefly, Bemisia tabaci Genn.; aphids, Aphis spp.; jassids, Empoasca spp. and green stink bug, Nezara viridula L.) during two soybean growing seasons;2009 and 2010. Data indicated that whitefly population was higher in the first season than in the second one on all the evaluated varieties, while the reverse was found for the other insects. Based on the mean number of the two successive seasons, Giza 111 significantly received the highest number of whitefly and jassids, followed by Giza 22, while Crawford and H 30 had the lowest whitefly and jassids density, respectively. Also, H 30 and Giza 111 significantly had higher number of aphids among the evaluated varieties. As for the green stink bug, the highest population was found on Giza 22, Crawford and Giza 111, while the lowest one was counted on Giza 21 and H 32. In respect to susceptibility degree, Giza 111, Giza 22 and H 32 appeared susceptible to whitefly and jassids, while Crawford and H 30 appeared moderately resistant to whitefly and jassids, respectively. Giza 111 and H 30 appeared susceptible to aphids, while the other varieties showed low resistance. Also, Giza22, Crawford and Giza111 appeared susceptible to the green bug, while Giza21 and H32 appeared as moderately resistant. Generally, it can be concluded that Giza111 was the highest infested variety with all the tested insects. On the other hand, Crawford was the least infested variety with the whitefly and aphids, while H30 was the least infested with jassids and the green stink bug.

This study was aimed to evaluate five clones of jojoba plant under the influence of salinity stress which was spraied by gibberellin and benzyl adenine on growth yield and oil. Two field experiments were carried out at Magharah Research and dmting Production which follow Desert Research Center, Agriculture Ministry, in North Sinai governorate, Egypt,  2015/2016 and 2016/2017 respectively, the experimemts wene consist of five clones (S-L, S-610, S- 700, S-B and S-G), (were sprayed by, GA3 200ppm, BA 200ppm and GA3+BA and control) under effect of salinity stress. The experiment was conducted as split plot design having varieties in main plot and IAA, GA3 sub plots three replicates. The jojoba plant was affected by increased GA3, BA or/and GA3+BA, and it was clear in all clones. The effect of GA3, BA or/and GA3+BA varied from one clone to another and the lowest was s-700. All studied variables  were confirmed that clones of jojoba had a significant effect with GA3, BA or/and GA3+BA

Two field experiments of jojoba plants were carried out in Almaghara Research and Production Station followed to Desert Research Center, Agriculture Ministry, North Sinai Governorate, Egypt, at 2016/2017 and 2017/2018, Respectively. Therefor to study the influence yield of five clones (S-L, S-610, S- 700, S-B and S-G) under foliar spray of salicylic acid, ascorbic acid and proline [(50:50:50(conc. 1); 100:100:100 (conc. 2) and 200:200:200 ppm (conic. 3)] on jojoba plants at four and fourteen years old from planting.  The experiment was conducted as split plot design, were varieties order in the main plots and treatments in sub plots, uisg three replicates. esults showed that the foliar application of salicylic acid, ascorbic acid and proline led to increase of all growth characters, yield characters and some chemical contents in leaves and seeds on all of clones. Clones S-700 recoded the highest values for all traits studied followed by clones S-B, while, studied traits, clones S-L recorded the lowest values. Foliar spray application with salicylic acid, ascorbic acid and proline had the highest data with all clones with aged fourteen years compear aged four years. All characters increased with increase in salicylic acid, ascorbic acid and proline on varieties, especially clone S-700. Jojoba plants appearance response to plant nutrition.