Biological Control of Pink Hibiscus Mealybug (PHM) Maconellicoccus Hirsutus (Green)

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Biological Control of Pink Hibiscus Mealybug (PHM) Maconellicoccus hirsutus (green) St. Kitts and Nevis 1995 Origin Pink Hibiscus Mealybug Africa India Pakistan Australia South East Asia Western Hemisphere Infestation PHM Caribbean Islands (Early 1990s) ◦ Trinidad (August 1995) ◦ Grenada (September 1994) ◦ St. Kitts (October 1995) PHM Reported attacking over 200 plant genera Attacking ◦ Fruits : Soursop, guava, grape ◦ Vegetables: pigeon pea, beans, maize, peanuts ◦ Fiber: cotton ◦ Ornamentals: Hibiscus, sorrel ◦ Trees: teak and mora Damage of PHM Toxic saliva ◦ Results in malformation of leaves, fruits and shoot growth ◦ Stunting of plant growth ◦ Occasional death of plant ◦ Shortened internodes “Bunchy Top” . Black sooty mold Economic Losses 47 plant species infested (limited distribution) ◦ Hibiscus, sorrel, vegetables sugar cane . Trinidad and Tobago . Over $125 million . 125 plant species (sugar cane, vegetables, cocoa, orchard crops) Grenada Over $10 million 130 plant species infested St. Kitts, PHM October 13, 1996 National Task Force Ministry of Agriculture CARDI Sugar Manufacturing Corporation Horticultural Society Control Insecticide Spraying, Pruning and Burning St. Kitts Biological Control Program Cooperative Effort: ◦ Ministry of Agriculture ◦ CARDI ◦ USDA, APHIS Establish Insectary Operation Host Plant Material: Japanese Pumpkin Mealybug Culture Parasite and Predator Cultures St. Kitts Biological Control Program Imported Exotic Natural Enemies from ◦ China ◦ Pakistan ◦ Egypt ◦ Malaysia ◦ Hawaii – USA Parasite Releases St. Kitts Anagyrus kamii – China (IIBC) ◦ Classical Biological Control ◦ Initial Releases: August 1st 1996 30 days- Average of 26% Parasitization Mealybug Population Density Reduced 2nd Instar to Adults mealybugs by 80% in 5 months (December 1996) Predator Releases St. Kitts Cryptolaemus montrouzieri – Augmentative Biological Control ◦ “Mealybug Destroyer” – Biopesticide ◦ Coleoptera: Coccinellidae ◦ Commercially Produced – California ◦ Release approximately 10, 000 adults/week in St. Kitts (200 to 500 adults/site) ◦ Significant reductions by 6-8 weeks at release sites ◦ Follow up with the release of Parasites .

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