Unit 8: Light Greenhouse Management

Objectives Objective 8.1 Define photosynthesis. Objective 8.2 Explain the characteristics of light and how it effects plant growth. Objective 8.3 Describe the light requirements of a plant. Objective 8.4 Explain the effect of day length on plant growth. Objective 8.5 Discuss ways to alter sunlight.

Objective 8.1 Define photosynthesis Photosynthesis: the process of converting air and sunlight into energy.

Objective 8.2 Explain the characteristics of light and how it effects plant growth Intensity Duration Quality

Objective 8.3 Describe the light requirements of a plant Light compensation point –Point at which the plant produces enough energy to meet respiration needs. Light saturation point –Point at which no more photosynthesis can take place

Objective 8.4 Explain the effect of day length on plant growth Short-Day Plants (SDP) –Flowers when the day length is shorter than a crucial number of hours. Poinsettias & mums –Long-Day Plants (LDP) Flowers when the day length is longer than a crucial number of hours. –Begonias & spinach

Day-Neutral Plant (DNP) –Day length does not effect the flowering of a plant. African violets & roses

Objective 8.5 Discuss ways to alter sunlight Shade cloth Grow lights Black-out cloth

Chapter 9 Temperature

What are three basics of temp? Minimum level at which, if the temp is below, growth does not take place Optimum level at which the plant grows best Maximum level at which the plant no longer grows

What causes desiccation When a temp continues to rise beyond the point that the plant can supply water fast enough for transpiration

Are temp requirements the same throughout all growing stages? Please explain. No

Why should one keep the temp over night? How large of a DIF should one use in a greenhouse? The cooler temps at night reduce respiration and saves more energy while the plant is not producing food. The higher clay temp maximizes photosynthesis. DIF=Cloudy days5 degree increase

What may happen to a plant if the DIF is too large? Some plants may seem to wilt while some may be permanently stunted.

Unit 10: Pesticide Use Greenhouse Management

Objective 18.1 Define pest Pest: –Anything that it actions or presents is undesirable. I.e. Bermuda grass in a flower bed is a pest

Objective 10.2 Define pesticide Pesticide: Any agent used to remove or control a pest.

Objective 10.3 Identify the different types pesticides Herbicide Insecticide Acaricide Avicide Miticide Fungicide Nematicide Bactericide

Objective 10.4 List and explain the different means of controlling pests Cultural Pest Control Biological Pest Control Mechanical Pest Control Chemical Pest Control Genetic Pest Control

Cultural Pest Control Uses management techniques to control pests.

Biological Pest Control Uses living organisms that are predators to control pests. –Lady bugs –Preying mantis

Mechanical Pest Control Uses tools or equipment for control –Plowing –Mowing –Mulching

Chemical Pest Control Using chemical for pest control –Insects Stomach poisons Contact poisons Systemic poisons Fumigants –Plants Pre-emergence Post-emergence

Genetic Pest Control The management of biological systems –Genetic manipulation to make plants resistant to specific pests.

Objective 10.5 List the 3 signal words found on a pesticide label Danger = Highly Toxic Warning = Moderately Toxic Caution = Slightly Toxic

Objective 10.6 List the proper equipment and clothing to use when applying pesticides Long-sleeved shirt Long-legged pants Gloves Goggles Respirator Hat Rubber boots

Objective 10.7 Explain the importance of pesticide label information Protects the applicator and those within the area –Some pesticides may “walk” or drift up to 4 miles. Maximizes effectiveness Prevents tolerance build up by pests Maximizes economical returns Reduces environmental containmination Protects non-targeted wildlife and plants