Includes bibliographical references.

Maize (Zea mays L.) is the most versatile crop among cereals which belongs to the family Poaceae. Maize, known as ‘Queen of cereals’, is the second most important cereal crop of the world and is cultivated in more than 170 countries spanning over the tropical and subtropical regions. Insect pests and diseases cause huge economic losses to the tune of 13.3%. The maize crop suffers from many production constraints and amongst them insect pests attack at various growth stages is of paramount importance. The extensive and indiscriminate use of conventional insecticides for Pests management of maize has led to several problem like resurgence of pests, reducing of beneficial organism, pesticides residues in corn. Hence, the present experiments were taken on “Population Dynamics and Biointensive Management of Major Insect Pests in Maize (Zea mays L.) Ecosystem in Meghalaya’’ was conducted in CPGS-AS experimental Farm at College of Agriculture, Kyrdemkulai, Meghalaya from March to July, 2023. A total 18 insect species were documented from maize ecosystem, out of which 14 species were observed as insect pests and 4 as natural enemies. Among all the insect pests, Fall armyworm (FAW), Spodoptera frugiperda was found most severe that causes economics losses and considered to be the major insect pest of Maize. The population of FAW was 1st noticed at 1st week of April and peak population in the last week of April. Correlation studies of Fall armyworm, Spodoptera frugiperda had significantly negative correlation with minimum temperature whereas Leaf hopper showed significantly positive correlation with maximum temperature and non-significant with other weather parameters. The evaluation of different biopesticides and chemical insecticide show that Emamectin benzoate 5% SG was found most effective against the S. frugiperda with highest yield (6.62 t/ha). Among the evaluated biopesticides, Bacillus thuringiensis var. kurustaki was found to be superior in reducing infestation of Fall armyworm and had significantly higher yield (5.20 t/ha) followed by Neem oil 0.03% (4.88 t/ha) and Metarhizium robertsii (4.71 t/ha). The highest percent corrected mortality (64.13%} was found in T6 treatment (Emamectin benzoate 5% SG) followed by Bacillus thuringiensis var. kurustaki (45.49%), Neem oil 0.03% (42.17%) and Metarhizium robertsii (41.13%). Among the treatment, Emamectin benzoate 5% SG had highest benefit cost ratio (2.51:1) followed by Bacillus thuringiensis var. kurustaki (1.48:1) and Neem oil 0.03% (1.44:1).