2019 NATIONAL FFA NURSERY/LANDSCAPE CDE GENERAL KNOWLEDGE EXAM

Which of these is NOT a benefit of using mulch around landscape plants?

• add nutrients to the soil

• help control weeds

• help prevent bark damage from string trimming

• conserve soil moisture

Propagating plants using seeds that have a hard seed coat often involves scratching the seed coat in a process known as:

• grafting

• stratification

• gradation

• scarification

Correcting low soil pH can be achieved by applying:

• lime

• potassium

• phosphorus

• nitrogen

Fertilizer is often applied through the irrigation system. This is often referred to as:

• fertigation

• chemigation

• post-fertilization

• fertilizer enhancement

While the desirable soil pH for plants varies by species, a general range for most landscape plants is:

• 1.0-7.0

• 5.0-10.0

• 5.5-6.5

• 1.0-14

Which of the following is a naturally occurring plant hormone which causes the elongation of cells in shoots and is often used as a root-promoting substance on cuttings used for propagation?

• ethylene

• auxin

• citric acid

• portulaca

The amount of a pesticide required to kill half of a population is referred to as:

• LD-50

• The re-entry level of a pesticide

• The half-life of the pesticide

• The 50-50 rating

A tree planted in the landscape that will grow up to 70 feet tall at maturity should be planted no closer than _____ feet from the house.

• 5 to 10

• 10 to 15

• 20 to 25

• 80 to 90

Iron chlorosis may be effectively treated with a product called ___________ iron.

• Chlorotic

• Anti-deficiency

• Chelated

• Formosan

This is a common disease caused by fungi and found throughout the United States. It is easily recognized by a white to gray powdery growth, usually on the upper leaf surface.

• Mealy Fungi Syndrome

• Powdery Mildew

• Cedar-Apple Rust

• Powdery Scale