Presentation on theme: "Insects & Diseases. IPM Defined: "IPM is a sustainable approach to managing pests by combining biological, cultural, physical and chemical tools in."— Presentation transcript:
IPM Pest management, not eradication, is the goal. Manage pests below the economic threshold.
Economic Threshold How would you define it? The point at which the disease or pest infestation begins to diminish the quality of the crop.
Economic Thresholds Thresholds should be quantitative and grower driven. For example, thresholds could be based on the average number of pests per trap each week. the percent of plants or leaves found to be damaged or infested during visual inspection. the number of pests dislodged per shake sample.
EIL ET Average density Time Pest density 80 70 60 50 40 30 20 10 0 Economic Threshold Apply controls Avoid exceeding economic injury level
Economic Thresholds Vary depending upon the crop. Bacterial Leaf Spot on Poinsettia: Devastating! Bacterial Leaf Spot on Greenhouse Tomatoes: Not such a big deal. Why? Insects & diseases on ornamental crops grown in nurseries: Big deal? Yes or no?
Also called “monitoring’. Perform weekly. In greenhouses focus monitoring near doorways, vents and fans. 1 card per 1,000 square feet. Yellow: attracts most flying insects Blue: for thrips Replace cards on a regular basis.
Sanitation The goal of sanitation is to eliminate all possible sources of the pest. weed removal inside and outside the greenhouse. ○ grass flowering-increase in thrips population weed removal around nurseries. dispose of dead/diseased plants. In greenhouses: ○ quarantine infested plants in a separate room. ○ medium pasteurization (especially if it contains soil). ○ algae control-fungus gnats.
Watering Too much moisture: leaf diseases root rots fungus gnats algae Too little moisture: stresses the plants and predisposes it to disease hot, dry conditions favor spider mites
Temperature Plants begin to stress at temperatures of 95 degrees F. and higher. Temperature fluctuations.
Growing Medium Should have good aeration/drainage. Monitor EC.
Chemical IPM Tactics: Biorational Pesticides Conventional Pesticides
Biorational Pesticides: Insecticidal Soaps Horticultural Oils Bacillus thuringiensis-bacteria Beauveria bassiana-fungus that infects the chitin exoskeleton of many pests Diatomaceous Earth IGR’s kill insects by disrupting their development
Conventional Pesticides Licensed Applicator WPS Re-entry Times Residue Resistance rotate between groups/active ingredients
Major Insect Pests of Greenhouse-Grown Bedding Plants: