Biological Control of Cotton Mealybug (Phenacoccus solenopsis):
When the invasive Phenacoccus solenopsis devastated cotton crops across India in 2006–2008, the solitary endoparasitoid Aenasius arizonensis Girault (formerly misidentified/known as Aenasius bambawalei Hayat, Encyrtidae) naturally adapted, providing parasitism rates exceeding $60 - 80\%$.
It remains the single most dominant, efficacious, and widespread bio-agent suppressing P. solenopsis across India.
Correct Option: Option 2 (Aenasius arizonensis).
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