Use of the Biological Compound Ret-flo Px357 to Increase Yield and Improve Fruit Quality of Tomato and Banana Grown in a Greenhouse
In the past few years, there has been a high demand for the use of new generations of biological products in modern agriculture. Several of these products are friendly to the environment and guarantee good yield and quality of many horticultural products. Pesticide residues resulting from heavy applications of a wide range of chemicals to control various pests is becoming a serious problem for exports, as well as for local consumption, of many products. This study was initiated to examine the effect of Ret-flo Px-357 a biological compound from EIBOL Co., Spain, developed to induce resistance to nematode infestation on several plants. `Daniella' tomato and `Grande naine' banana grown in plastic greenhouses were used to evaluate these effects. Two ground applications of Px357 at the rate of 20 L·ha–1 were used at 4-month intervals in Oct. 1996 and Feb. 1997. These treatments have stimulated root formation, stem diameter, and plant height. In tomato plants, the number of flowers and fruits per cluster was greater in treated than in non-treated plants. After harvesting eight clusters from the tomatoes, the number, size, individual fruit weight and total production of fruits from treated plants were greater than for the control plants. Similar results were observed in banana plants, which showed larger pseudo-stem and heavier fruit bunches at harvest. Variation in nematode population as well as plant nutrition during plant growth will be discussed, and results related to fruit quality will be presented and commented upon.