Population Fluctuation of Bemisia Tabaci (L) and its Associated Predators under Combined Effects of Sowing Date and Varieties

The sowing date is very crucial among agronomic techniques for ensuring productivity and controlling insect pest. In 2018 and 2019, sowings were carried out 15 days intervals, starting on March 1 and ending on June 16. The dates were: March 1, March 16, April 1, May 1, May 16, and June 1. On advanced cultivars of Bt cotton, namely MNH-1026, MNH-1050, and IUB-13, the whitefly, Bemisia tabaci (Aleyrodidae: Hemiptera), and beneficial/predatory fauna were researched (control). The statistical analysis was multivariate. The relationship between the predatory fauna and the prey (whiteflies) in the correlogram was favourable. Predators showed a positive association with whitefly (0.592), boll weight (0.681), boll number (0.872), and seed cotton production (0.886) per acre, in that order. It was determined through Principal Components Analysis (PCA) that PC1 had an Eigen value \u3e1 and accounted for 79.3% of the overall variation due to the greatest positive loading vectors. It was determined that because late planting had a short growing period, whiteflies attacked it less frequently. It was determined that short-season crop cultivation and the breeding of resistant germplasm are advantageous in the face of climate change

Estimation of Genetic Diversity among Canola Accessions using Simple Sequence Repeat Markers

Genetic studies through molecular markers proved important to find out the genetic diversity of canola. In this study, 50 lines of canola were used to find the polymorphism using 15 SSR primers and investigated the genetic diversity, PIC values, frequency-based genetic distance, and allelic frequencies. Mean gene diversity, frequency-based genetic distance, and PIC values were 0.8777, 0.233 and 0.8666, respectively for the canola lines. A good range of genetic diversity was found among studied canola lines with value 85.91% polymorphism. Maximum and minimum genetic distances among 50 lines were 1 and 0.26, respectively. Accessions ACC-26068, ACC-24241, ACC-24244, ACC-24233, ACC-24423 and ACC-24224 have maximum genetic distance. Accessions ACC-24879 and ACC-24169 had minimum genetic distance i.e., 0.26. Dendrogram based on genetic distances showed four main clusters that were further dividing into several sub-clusters. The primers utilized in the present study, were valuable to identify different accessions of canola to find the variability present. This variability will be helpful to initiate the breeding program with their molecular genetic basis

A Review on Overcoming Dual Challenges for Maize Cropping under High Plant Density: Stalk Lodging and Kernel Abortion

Increased optimal plant density is necessary in ensuring future food security by increasing crop productivity. However, maintaining relatively high plant density has to overcome two challenges i.e. kernel abortion and stalk lodging. The response of maize to increased plant density and the effects of increased plant density on maize productivity were discussed in this research. Increased plant density induces increased plant height, causes low photosynthetic capacity, limits the carbohydrate supply and increases kernel abortion. Also, increased plant density incurs a high risk of stalk lodging due to increased ear height and diminished stem diameter associated with reduced vascular bundles that provide, mechanical force. This review proposes a potential capacity of sucrose storage in stalk for tackling kernel abortion and stalk lodging. The mechanisms of boosting stem sugar storage with more efficient unloading, transporting, and storage in internodes are discussed