Induction of systemic acquired resistance in date palm plants against certain plant parasitic nematodes by some chemicals

A field experiment was conducted at Faculty of Agriculture Farm in Giza Governorate, Cairo University, Giza, Egypt on clay loam soil planted to date palm cv. Zaghlool infested with plant parasitic nematodes, Rotylenchulus reniformis and Helicotylenchus sp. An experiment was carried out to investigate the efficacy of acetyl salicylic (ASA) and γ-amino-n-butyric acids (GABA) as chemical resistance inducer at the concentrations of 5, 10 and 20 mM against nematodes and consequently on date palm yield. The results showed that number of R. reniformis in soil and roots and Helicotylenchus sp., were reduced in soil one month after application at the harvest according to the tested concentrations as compared with control significantly (p≤0.05). GABA achieved at the highest and moderate concentrations the highest dates yield (%) increases (25.4 and 17.8%) as compared to ASA (16.2% and 12.9%), respectively. The lowest concentration from each material achieved the lowest result.