CPRT Lec 5 - Genetic Control of Insect Pests Flashcards
yagballs
It is the manipulation of genetic components or other inheritance mechanisms in an organism.
Genetic Control
Most widely used technique of Genetic Control
Sterile Male Technique/ Sterile Insect Technique
This procedure involves mass-rearing insects, subjecting them to sterilization by irradiation or chemical mutagens, and releasing large numbers of males to mate with wild females
SMT/SIT
Example of chemical sterilant
tris-(1-aziridinyl) phosphine oxide
is tris-(1-aziridinyl) phosphine oxide carcinogenic?
Yes lol and should be used with caution
When was SIT developed?
1940s and 1950s
Which insects did SIT programs have effectively eradicated?
Screwworm in North and Central America; Mediterranean Fruit Fly in Florida;
What suppresed fruit fly populations in mangoes?
Sterile Insect Technique and Male Annihilation Technique
Im which area/institution were fruit fly populations suppresed in mangoes?
Guimaras, Iloilo with collaboration of Philippine Nuclear Research Institute and National Mango Research and Development Center
Is the heritable property that enables a plant to inhibit pest population growth or recover from an injury caused by populations not inhibited from groing
Resistance
How are genes from wild relatives of crops utilized?
deployed in different crops to make the plants resistant
considered a false resistance or pseudo resistance because it is under the primary control of the crop’s environment.
Ecological resistance
right and real resistance because it is governed by resistance genes inherent to various introduced cources
Genetic resistance
2 types of Ecological Resistance
Phenological asynchrony and Induced Resistance
In ______, the crop/s susceptible stage does’nt coincide with the pest population’s peak such that the plant escapes the damage
Phenological asynchrony
________ is brought by the plant’s proper care such as fertilization and other practices that make them resistant to insect pest attack
Induced Resistance
A type of resistance under the primary control of the plants’genetic factors and is consiered real resistance
Genetic resistance
Three mechanisms of insect resistance (Painter 1951)
non-preference, antibiosis, and tolerance
Non-preference was later named ____ by Kogan and Ortman (1978)
Antixenosis
Occurs when a pest is less likely to find or feed on a resistant plant
Antixenosis
Occurs when feeding on a resistant plant harms the pest’s health or fitness
Antibiosis
Occurs when a plant can continue to thrive despite being attacked
Tolerance
Defined as the host plant’s ability to exclude or overcome a pathogen’s effect entirely or to some degree
Host Plant Resistance
The use of ____, if available, is perhaps the best pest control method for managing pest and disease problems
Resistant varieties
