This study was conducted to minimize the population of root-knot nematodes, Meloidogyne incognita under field conditions for two seasons 2005, 2006 in superior seedless vineyards and its reflection on vine growth and yield. The investigation was carried out in a private vineyard (El Wady El Faregh) in Alexandria-Cairo road (kilo 78). Six treatments (dry powder of Lantana camara (30, 60, 90 gm) dry powder of Nerium oleander ( 30, 60, 90 gm), suspension of Psudomonas fluorescens (1×105, 1×108, 5×108) suspension of Arthrobotrys oligospora (1×10 5, 1×108 , 5×10 8) and animal compost (10 kg/tree) were applied in addition to the nematicide, Mocap (40 kg/feddan). All natural plants and biogents were added to the soil under vines three times/week after bud burst. Data showed that use of animal compost (10 kg/tree), Psudomonas fluorescens (1×108, 5×108), suspension of Arthrobotrys oligospora (1×108, 5×108) dry powder of Lantana camara (60gm) and Nerium oleander (90 gm) were most effective in decreasing the total population of root-knot nematodes, Meloidogyne incognita after three months from the time of their application under field conditions for the two seasons of the investigation. Using both animal compost and suspension of Psudomonas fluorescens were more effective in reducing total population of root-knot nematodes, Meloidogyne incognita whereas, the least effective was the dry powder of Nerium oleander under field conditions. Animal compost at 10 kg/vine and the bioagent; P. fluorescens (at 5×108) showed the highest efficacy in reducing the total population of root-knot population (Meloidogyne incognita). This was reflected on achieving the best vegetative growth parameters and increasing leaf area, wood ripening coefficient, total chlorophyll and percentages of (N, P and K) in the leaves. Data also showed that the horizontal extension of fine roots was more concentrated at the distance of (50cm) from vine trunk than those at the distance of (100 cm) from vine trunk.The extension of fine roots through the vertical direction (root density) expressed as length of the fine roots was significantly higher at (0-30cm) depth than that found at (30-60cm) depth in the soil profile. In addition, an obvious increase in medium roots (2-6mm) was observed either at (50cm) distance or at (30-60cm) depth. The growth of medium roots was reduced by increasing the distance more than (50cm) from vine trunk or the depth more than (30cm) from soil surface. The results also indicated that all treatments used significantly increased cluster weight, number of clusters per vine, yield per vine as well as physical characteristics of berries. TSS%, TSS/acidity ratio were increased whereas acidity was decreased in berry juice. From the foregoing results, it can be concluded that compost at 10 kg/vine and the bioagent; P. fluorescens (at 5×108) induced a remarkable reduction in the nematode population (Meloidogyne incognita) and improved fruit quality and yield of Superior Seedless grapevines

This study aimed to use Thiourea at different concentrations as nitrification inhibitor, ammonium sulphate as mineral nitrogen fertilizer and bacterial strain Bacillus polymyxa as plant growth rhizobacteria regulator individual or /and in combination with tomato plants to control the population of root knot nematodes Meloidogyne incognita under laboratory and greenhouse experiments . Laboratory experiment revealed that high percentage of juveniles mortality occurred during all the exposure periods of all treatments especially after 72 hr. The data also showed that the use of combination treatments (Thiourea, ammonium sulphate and Bacillus polymyxa) had significant effect on juveniles mortality especially at the highest concentration of Thiourea (3% /pot). While, using of ammonium sulphate individually showed the lowest effect of mortality. On greenhouse experiment combination of all treatments showed the most reduction effect of numbers of galls, egg masses, egg numbers/plant and number of 2nd stage juvenile in tomato rhizosphere soil. On the other hand, ammonium sulphate individually showed the least effect on the treatments. In addition all the combination treatments increased the fresh weight of tomato roots and shoots, except the highest concentration of Thiourea at level of 3 % /pot had negative effect on tomato plants.Summing up of these results due to the increase of ammonium levels around the tomato rhizosphere caused highly reduction of nematode populations

Abstract:
Two field trials with 25 years old mango trees, cvs. Taimour, Mabrouka, Zebda , Alphonso, Piri, Ewase, Fagri-Klan, Sedeek, Mesk, Kobania, Dabsha, Langara, Hindi, Julic and Keitt were conducted during 2003 and 2004 at Fayoum governorate, Egypt. to determine the relative susceptibility of these cultivars to Infection with floral malformation disease . The obtained results showed that the mean incidence of malformed panicles was the least for cvs. Langara, Hindi, Julic and Keitt. While moderate malformation was recorded for cvs. Fagri-Klan, Sedeek, Mesk, Kobania and Dabsha. Meanwhile, the highest susceptible cvs. were Taimour, Mabrouka, Alphonso, , Piri and Ewase. Concerning the effect of NAA at 200 ppm, IBA at 500 ppm, GA3 at 50 ppm, and Cuprous Oxide (Cu2O) at 0.4%. on the incidence of floral malformation disease and yield of Taimour mango trees, the results showed that the incidence of floral malformation disease was sharply reduced in the next flowering season by using any of the used treatments, compared with the untreated trees, Also, the produced fruit yield from treated trees was significantly higher during the first and the second seasons in
comparison with that of the untreated trees. NAA gave the best results followed by IBA, GA3 and Cuprous oxide, respectively.

Key words: Mango malformation .Cultivars reaction , NAA, IBA, GA3, Cuprous