Tag: zoology

Third generation pesticides refer to insect growth regulators, specifically juvenile hormone analogues, which disrupt the development of insects rather than killing them directly through toxicity.

The sterile insect technique (SIT) was famously and successfully used to eradicate the New World screw-worm fly from North America by releasing large numbers of sterilized males.

Margosa (Neem) extracts have been used traditionally for centuries as natural pesticides, making them the earliest form of botanical pest control compared to synthetic options like DDT.

Bacillus thuringiensis have Bt toxin encoded by cry genes forming cry proteins.

Azadirachtin is the primary active limonoid compound found in neem seeds and leaves, widely recognized for its efficacy as an insect repellent and growth disruptor.

The egg pathogenic fungus Paecilomyces lilacinus is a biocontrol fungus for check from nematodal pathogens of plants.

Devine and Collego are well-known commercial trade names for bioherbicides. Devine uses Phytophthora palmivora, and Collego uses Colletotrichum gloeosporioides.

The fungus Trichoderma species are free-living fungi that are very common in root ecosystems and are effective biocontrol agents of several plant pathogens.

Answer is option C i.e. "Marigold"
Biodegradable insecticides are types of insecticides derived from natural materials as plants, bacteria, etc. Bioinsecticide from marigold flowers contains chemicals called thiophenes which are toxic to the larvae of mosquitoes that carry malaria and yellow fever. Bioinsecticide made from marigold also contains repellent against major tomato pests: whiteflies, thrips, and spider mites.

Rotenone is a naturally occurring isoflavone obtained from the roots of several tropical plant species, such as those in the genus Derris, and is used as a botanical insecticide.