Chemical Class and Biochemical Mode of Action
Magister belongs to the quinazoline chemical class and functions as a Mitochondrial Electron Transport Inhibitor (METI - IRAC Group 21A). It specifically blocks electron transfer at Complex I within the insect mitochondrial respiratory chain.
This metabolic blockade halts ATP synthesis in cellular mitochondria, leading to immediate energy depletion, motor cessation, and rapid paralysis across both juvenile and adult mite developmental stages.
- Contact and Ovicidal Action: Destroys active mite life stages (larvae, nymphs, adults) and prevents unhatched mite eggs from completing development.
- Broad Acaricidal Spectrum: Controls Tetranychidae (spider mites), Eriophyidae (gall and rust mites), and Tarsonemidae (broad mites).
- Rapid Knockdown: Feeding activity stops within hours of foliar exposure, protecting leaves from chlorotic stippling and webbing damage.
Target Crops and Infestation Indicators
Phytophagous mites proliferate aggressively during warm, dry, and low-humidity weather conditions. Severe infestations cause leaf bronzing, chlorotic speckling, severe leaf drop, and dense webbing on shoot terminals, which severely suppresses photosynthetic efficiency.
Magister is registered under CIBRC standards for controlling mite complexes in plantation tea bushes, chilli crops, brinjal, okra, apple orchards, and rose floriculture.
- Tea Plantations: Effectively curbs red spider mite (Oligonychus coffeae) and pink mite (Acaphylla theae) outbreaks.
- Chilli Crops: Controls yellow mite (Polyphagotarsonemus latus) infestations that cause severe downward leaf curling and stunted flower drop.
- Apple Orchards: Controls European red mite (Panonychus ulmi) and two-spotted spider mite populations on foliage.
Foliar Spray Technique and Resistance Management
Because phytophagous mites inhabit the undersides of leaves and form protective silken webbing, high-volume foliar spraying with fine droplet coverage is necessary. Use hollow cone nozzles directed thoroughly into inner plant canopies.
To prevent mite populations from developing metabolic resistance to METI-class chemistry, rotate Magister with acaricides having different modes of action, such as Spiromesifen, Propargite, or wettable sulphur formulations.
- Canopy Penetration: Ensure high spray volume to thoroughly wet lower leaf surfaces where mite colonies cluster.
- Rotation Strategy: Do not apply consecutive sprays of Complex I inhibitors in the same crop growth cycle.
- Safety and PHI: Observe mandatory pre-harvest intervals and wear personal protective equipment during chemical handling.
Official source
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Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What is the active technical ingredient in Magister?
Magister contains Fenazaquin 10% EC, a specialized acaricide from the quinazoline chemical group.
How does Fenazaquin kill mites?
It acts as a Mitochondrial Electron Transport Inhibitor (METI) at Complex I, halting cellular energy production and causing rapid paralysis and death.
Does Magister have ovicidal activity against mite eggs?
Yes, Magister exhibits strong ovicidal properties, preventing mite eggs from hatching in addition to providing knockdown against nymphs and adult mites.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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