Pest Disease Triangle
What are all three corners of the disease triangle?
The storage location of calcium in cells that isn’t able to be translocated to the outer most edge of the leaf?
What is the vacuole?
Name the yellowing of leaf tissue due to a lack of chlorophyll.
Chlorosis
This mineral is responsible for cell wall linkages and primarily pulled through the xylem via transpiration.
What is Calcium
This phytochemical process produces carbon dioxide and water, and is used for growth and repair.
What is respiration?
Having an intercanopy humidity of 99% is covered by which corner(s) of the disease triangle?
The conducive environment corner, since many foliar pathogens require water on leaves to propagate.
Name the symptoms of wet tip burn
It is characterized by necrotic (brown) spots on the tips and edges of rapidly developing young leaves in lettuce. Typically seen when there is suboptimal air movement around the canopy where evaporation cannot occur.
The directed movement of an organ or organism in response to light stimuli.(Typically, these stimuli induce hormone transport that triggers cell growth or deformation.)
Phototropism
This mineral nutrient is primarily utilized in building amino acids and proteins.
What is nitrogen (or Sulfur, or Carbon) ?
What is transpiration?
Leaving doors to the grow zone open to the outside world is covered by which corner(s) of the disease triangle?
Pest/disease organism presence (letting them in the grow zone)
Name symptoms of dry tip burn.
It is characterized by necrotic spots on edge of the leaf accompanied with the drawstring effect on the morphology of the plant. Necrotic spots are dry to the touch.
This photoreceptor is sensitive to UV-A - blue (and green) spectra.
What is cryptochrome?
This mineral nutrient remains as a free ion in to cellular structures, which affects cellular osmotic potential and water dynamics (think guard cells). Also, used as a cofactor in enzymatic reactions.
What is potassium?
A thick boundary layer would result in (open or closed) stomata and (slow or fast) diffusion.
What is open and slow?
Accidentally dosing too much zinc sulfate in the nutrient mix and causing a zinc toxicity in the plants is covered by which corner(s) of the disease triangle?
Vulnerable host, especially for root pathogens
Name a common result of calcium deficiency in fruiting crops.
Blossom end rot
This metabolic pathway that occurs in photosynthetic organisms and releases carbon dioxide, consumes oxygen, and produces no chemical energy or food. This process limits the growth rates of plants.
What is photorespiration? This occurs when stoma close and reactive oxygen species build up in intercellular tissue (typically times of heat/drought stress)
This mineral nutrient is primarily used in chlorophyll synthesis.
What is magnesium?
Give 3 examples of "Sinks" on a plant.
What are fruit, roots, flowers, meristematic tissue, seeds, young unexpanded leaves, old senescing leaves.
Which corner(s) of the disease triangle discourage us from propagating all of our plants from cuttings?
This element is important in Photosynthesis, Stomatal Conductance, and ATP synthesis. It also has an antagonistic relationship with Calcium.
Potassium
What would be an effect on photosynthesis of drought stress causing the stomata to close?
Closing of the stomata leads to a decrease in CO2 assimilation and CO2 concentration in the cell and therefore a decrease in photosynthesis.
This mineral nutrient is the main building blocks for sugars and cellular tissue.
What is carbon?
This plant stressor may cause the tomato plant to avoid future stress by growing smaller leaves with smaller stomata diameter.
What is drought stress?