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.
For home fruit growers the time is here to make annual dormant oil application on selected fruit trees and small. fruit species. This is probably one of the most important sprays that can be applied to fruit trees, and one of the least. toxic of all spray materials for the homeowner to handle. Dormant oil is a refined petroleum product formulated for. orchard tree use. It has been in use for well over a century in commercial orchards, and is still regularly used today.