The terms "male" and "female," when used to describe trees, fit as awkwardly as someone else's shoes. Although the flowers of flowering trees (the angiosperms) and the cones of conifers (the most prominent of the gymnosperms) need to be fertilized with pollen to produce f...
Since the early 1900s, the Eurasian woodwasp (Sirex noctilio F.; Hymenoptera: Siricidae), a pest of pine (Pinus spp.; Pinales: Pinaceae) trees, has been introduced to various regions in Southern Hemisphere and North America. Among the most effective biocontrol agents of S. ...
To solve the question regarding the occurrence of male and female cones in Pinus, we can follow these steps:1. Understand the Structure of Pinus: - Pinus, commonly known as pine trees, has distinct male and female cones. Th
IT is well known that seedling trees of Pinus sylvestris, in common with those of many other woody species, pass through a juvenile period, during which no reproductive organs are formed. The first female cones appear at the age of about seven years, while male cones are not usually formed...
(Reitter), andA. ferus(Mulsant), invaded Australia and New Zealand, causing damage in stressed pine trees and negatively affecting timber trade10,14. At the beginning of this century,A. rusticusalso invaded Argentina22,23, and it has now dispersed throughout pine production areas in the ...
Angiosperms have both female and male gametophytes, which produce haploid gametes. The gametophyte is the sexual phase of the multicellular haploid plants with alternation of generations. The life cycle of most plants involves alternation of generations, or metagenesis, comprising two stages: a ...
(+)-endo-Brevicomin was detected in a small percentage of female D. frontalis, whereas (-)-endo-brevicomin was never detected in either sex. In field trapping bioassays, we confirmed that (+)-endo-brevicomin is a potent synergist for attractive combinations of frontalin and pine ...
For trees, the pine (松) tree is male because it contains a male radical (部首) and the plum (梅) tree is female because it has a screeic component (或分) in the word.The student found the answer interesting but not very excellent. However, it happened that the title of the thesis...
Identification of the Female-Produced Sex Pheromone of the Plant Bug Apolygus spinolae Apolygus spinolae (Meyer-D眉r) (Heteroptera: Miridae) is an important pest of fruit and tea trees in Korea and Japan. Analyses of extracts of metathoracic ... Chang,Yeol,Yang,... - 《Journal of Chemical...
The material from which Saussure descriptionbed Crypsicerus cubicus in 1888 was immature. The first adult female of this rare species was descriptionbed only recently by Rehn (1955) on material from Swakopmund, S.W.Africa. Further specim... HD Brown 被引量: 0发表: 1962年 ...