FFECT OF FERTILIZERS ON INCIDENCE OF APHID AND BENEFICIAL ARTHROPODS IN MUSTARD

Abstract

An experiment was conducted in the central field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from November, 2019 to February, 2020 to evaluate the effect of fertilizers on incidence of aphid in mustard. The experiment was laid out in Randomized Complete Block Design replicated with three times. For this study, treatments were- T1: Urea recommended dose + MoP recommended dose + Boron recommended dose; T2: Urea ¾ of recommended dose + MoP recommended dose + Boron recommended dose; T3: Urea recommended dose + MoP ¾ of recommended dose + Boron recommended dose, T4: Urea recommended dose + MoP recommended dose + Boron ¾ of recommended dose, T5: Urea ¾ of recommended dose + MoP ¾ of recommended dose + Boron recommended dose, T6: Urea recommended dose + MoP ¾ of recommended dose + Boron ¾ of recommended dose, T7: Urea

¾ of recommended dose + MoP recommended dose + Boron ¾ of recommended dose and T8: Urea ¾ of recommended dose + MoP ¾ of recommended dose + Boron ¾ of recommended dose. The incidence of aphid at early, mid and late flowering stage and fruiting stage, the number of infested plant and percent plant infestation become low (0.63, 0.83, 0.97, 1.33 aphid, 1.11 plant and 3.68%, respectively) at the treatment T7 and number of aphid at inflorescence at early, mid and late flowering stage, number of infested inflorescence, percent inflorescence infestation, number of infested siliqua, percent siliqua infestation and average number of deformed siliqua (0.39 aphid, 0.46 aphid, 0.49 aphid, 0.81 inflorescence, 13.04%, 17.84 siliqua, 12.07% and 3.38 siliqua, respectively) was low at T7 treatment. The number of healthy plant, number of lady bird beetle, number of field spider, number of ant, number of dragon fly, plant height, number of branches, number of siliqua, length of siliqua, seeds per siliqua, 1000 seeds weight and yield of mustard were high (30.13 plant, 2.13 lady bird beetle, 1.56 field spider, 1.12 ant, 0.98 dragon fly, 118.78 cm, 12.57 branches, 130.47 siliqua, 3.89 cm, 28.47 seeds, 3.82g and 2.78 t/ha, respectively) at T7 treatment.