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.
growing season. However, dormant oil decreases the insect populations by killing overwintering adults and eggs, and thus slows seasonal build-ups. This makes it well worth the extra time and cost. Dormant oil is regularly used on apple, pear, plum, quince and crabapples. It is also recommended for use on currant and gooseberry bushes. As the word dormant implies, this spray should be applied before the buds swell or before new growth starts in the spring. If applied after growth starts, the new tissue can be damaged. Application