Burnt husk added to the soil at the rate of 200 g/m² gave the highest reduction 50.48, 48.72%, highest root yield 25.16, 24.60 ton/fed, foliage yield 8.99, 8.60 ton/fed, sucrose percentage 16.71, 17.43%, T.S.S%20.40, 20.60%, purity 81.91, 84.61% and white sugar 4.20, 4.29 ton/fed in the two seasons, respectively. Spray of silica NPs at the rate of 4g/L gave the highest reduction 68.46, 77.81%, root yield 26.03, 26.01 ton /fed, foliage yield 8.60, 8.36 ton/fed, sucrose percentage 18.80, 19.00%, TSS% 22.90, 22.60%, Purity 86.46, 84.07% and white sugar 4.89, 4.94 ton/fed in the two seasons, respectively.

In the laboratory, the toxic effect of each of silica NPs, potassium silicate, magnesium silicate and sodium silicate for 2^nd larvae instar after 96 hr., was and found that Lc₅₀values were 0.079, 0.212,0.239 and 0.261 g/L. While the corresponding values for 4^th after 96 hr., were 0.120, 0.218, 0.261 and 0.594 g/L, respectively.