In flowering plants, the megagametophyte (also referred to as the embryo sac) is much smaller and typically consists of only seven cells and eight nuclei. This type of megagametophyte develops from the megaspore through three rounds of mitotic divisions.t consists of three parts: The integument(s) forming its outer layer(s), the nucellus (or remnant of the megasporangium), and female gametophyte (formed from haploid megaspore) in its center. The female gametophyteâspecifically termed a megagametophyte âis also called the embryo sac in angiosperms.
Late winter or early spring is the best time to begin spraying an apple tree. Using horticultural oil spray helps to destroy any insects and their eggs on the tree before new growth begins.
One effective method of protecting fruit trees from overwintering pests and their eggs is spraying dormant oil in late winter or early spring. When it comes to encouraging a healthy and productive fruit tree, there are two big things you can do to help.One is to select and maintain a clean and ideal growing site.ou need: 1  Fruit trees (like apples, pears, plums, peaches, cherries). 2  Dormant oil (like Horticultural & Dormant Spray Oil *) â not just any oil. 3  Spray applicator (like this Pump & Spray Applicator or Auto Mix Sprayer).