RANA, RAJINDER SINGHSHAILZA2018-12-182018-12-182018-09http://krishikosh.egranth.ac.in/handle/1/5810086031ABSTRACT The present investigations entitled “Studies on the effect of organic interventions for the management of insect pests in pea seed crop” were conducted during the year 2017-2018 at the Research Farm and laboratory of Department of Seed Science and Technology, Dr Yashwant Singh Parmar University of Horticulture and Forestry, Nauni, Solan (HP). The experiment was laid out in Randomized Complete Block Design (Factorial) in the field with three replications and Completely Randomized Design (Factorial) in Laboratory with four replications of each treatment. The pea cv. Punjab-89 was sown in 1st November, 2017 in a plot size of 2.25 x 1.20m2 under ten treatments T1 – neem kavach @ 3ml/l, T2 – neem kavach @ 4ml/l, T3 – neem kavach @ 5ml/l, T4 – neem kavach + sulfex (5ml + 2g/l), T5 – butter milk + neem kavach (20ml + 5ml/l), T6 – cow urine + butter milk (50ml + 50ml/l), T7 – jeevamrit @ 11%, T8 – neemastra @ 9%, T9 – oxy-demeton methyl @ 1ml/l (standard check) and T10 – control (no spray). Among organic interventions, crop sprayed with T3 neem kavach @ 5ml/l was better than rest of organic interventions for the trait viz.,number of pods per plant (13.89), pod length (10.06cm), number of seeds per pod (7.47), seed yield (0.640 kg/plot, 18.96 q/ha), benefit: cost ratio (1.88:1), minimum insect pest population (3.19 galleries/plant) and maximum protection against insect pests (67.14%), Seed quality parameters i.e. hundred seed weight (13.89 g), seed germination (95.50 %), seedling length (27.26 cm), seedling dry weight (40.82 mg), seed vigour index-I (2603.38), seed vigour index-II (3898.06) and minimum electrical conductivity (0.935 dS/m). The treatment T3 – neem kavach @ 5ml/l gave highest benefit: cost ratio (1.88:1), followed by treatment T5 (1.85:1) which was at par with T2 (1.85:1). In comparison to organic interventions, T9 oxy-demeton methyl @ 1ml/l (standard check) was at par with organic intervention treatments, for the trait viz.,number of pods per plant (14.01), pod length (10.15cm), number of seeds per pod (7.53), seed yield (0.646 kg/plot, 19.20 q/ha), benefit: cost ratio (1.93:1), minimum insect pest population (2.92 leaf miners/plant) and maximum protection against insect pests (71.59%), Seed quality parameters i.e. hundred seed weight (14.01 g), seed germination (96.75 %), seedling length (27.83 cm), seedling dry weight (41.31 mg), seed vigour index-I (2692.67), seed vigour index-II (3996.84) and minimum electrical conductivity (0.914 dS/m). Hence, the crop sprayed with neem kavach @ 5ml/l was most effective for plant growth parameters and provided maximum protection from insect pests which resulted higher yield of quality seeds in pea.ennullThesis