applicator

Question 1

Annual and perennial weeds in corn, soybeans, and grain sorghum fields are considered a continual problem and are difficult to control with herbicides.

Answer 1

False

Question 2

Shattercane and Johnsongrass are forage-type sorghums that are probably the most troublesome weeds in

Answer 2

grain sorghum

Question 3

Once the seedbed is prepared… the main reason for tillage is

Answer 3

weed control

Question 4

No till crop systems rely heavily on herbicides to control weeds.

Answer 4

True

Question 5

Cultivation becomes difficult in soybeans when the row widths are less than _________________ inches.

Answer 5

20

Question 6

will typically result in poor activation of soil applied chemicals.

Answer 6

Lack of rainfall

Question 7

A 100% no till system will have ____________________________ perennial weeds as compared to fields that use reduced tillage systems.

Answer 7

less

Question 8

Which of the following are insect pests that can be a problem in Missouri Corn

Answer 8

European Corn Borer 
  Fall Armyworm 
  Black Cutworm 
  Corn Earworm 
  Southwestern Corn Borer

Question 9

___________________ suck the juices from grain sorghum with their piercing -sucking mouthparts.

Answer 9

Chinch bugs

Question 10

Insects are considered a major problem to producers that grow soybeans in Missouri.

Answer 10

False

Question 11

Which of the following are considered occasional insect pests of soybeans?

Answer 11

Green Cloverworm 
  Corn Earworm 
  Grasshoppers 
  Seed Corn Maggot 
  Soybean Thrips

Question 12

Seed rots in corn occur ___________________________ germination.

Answer 12

before

Question 13

Rots and blights in corn are more severe in __________________________ conditions.

Answer 13

wet

Question 14

Which of the following is not a good management practice when trying to prevent corn rot and blight?

Answer 14

Planting when temperatures are below 50-55 degrees F

Question 15

Which of the following are good practices for management of corn foliage diseases?

Answer 15

Planting disease resistant corn hybrids
Rotating crops with at least one year out of corn
Managing corn residues
Applying foliar fungicides if warrented

Question 16

Corn that is stressed by poor growing conditions such as: lack of moisture, poor fertility, or additional stresses is more likely to be damaged by nematodes.

Answer 16

True

Question 17

Stalk rots become a problem when plants are stressed during the ____________________________ stage of development.

Answer 17

grain filling

Question 18

Corn can get kernel rots from fungi while it is in the field or when it is in storage.

Answer 18

True

Question 19

Nematodes cause damage to corn by

Answer 19

feeding on the root

Question 20

What size are nematodes?

Answer 20

microscopic

Question 21

Foliage diseases of Sorghum usually favor which of the following conditions?

Answer 21

Warm Temperatures
Wet Weather
High Humidity

Question 22

Which of the following is not a foliage fungal disease that affects sorghum in Missouri?

Answer 22

Pythium

Question 23

Root and stalk diseases of grain sorghum usually occur at what time and stage of plant development?

Answer 23

Late season as plants are maturing

Question 24

General symptoms of early season soybean diseases range from seed decay, pre- or post-emergence damping off, and/of wilt and death of established seedlings.

Answer 24

True

Question 25

Soybean diseases can be caused by fungi, bacteria, or viruses.

Answer 25

True

Question 26

Pythium, Phytophthora, Rhizoctonia, and fusarium diseases are all diseases that cause problems in the _________________________ season.

Answer 26

early

Question 27

Septoria brown spot, bacterial blight, downy mildew, and powdery mildew are all examples of ______________________ diseases of soybeans.

Answer 27

foliage diseases

Question 28

Bean pod mottle, soybean mosiac and tobacco ringspot or budlight are all examples of _______________________ diseases of soybeans.

Answer 28

viral

Question 29

Soybean cyst nematode affects soybeans in _________________________ season.

Answer 29

mid-late

Question 30

Soybean cyst nematode, charcoal rot, pod and stem blight, anthracnose, stem canker are all examples of ________________________ season diseases in soybeans.

Answer 30

late

Question 31

Cotton requires very few herbicide applications or cultivation

Answer 31

false

Question 32

There are _________________________________ herbicides that are available and registered for weed control in cotton.

Answer 32

very few

Question 33

Over the top herbicide applications are difficult so _______________________ applications are often used.

Answer 33

directed

Question 34

It is important that weeds get taller than the cotton so that treatment of them is easier.

Answer 34

false

Question 35

Spraying insecticides on cotton are rarely needed.

Answer 35

false

Question 36

Bacterial blight and several fungal leaf spot diseases are common foliage diseases of cotton in Missouri.

Answer 36

true

Question 37

Verticillium wilt and Fusarium wilt are are both common wilt diseases of cotton.

Answer 37

true

Question 38

Nematodes do not cause damage to cotton

Answer 38

false

Question 39

Nematodes cause damage to cotton by

Answer 39

feeding on roots

Question 40

Which of the following is the cause of boll rot?

Answer 40

fungi

Question 41

Rice weed control is much the same as weed control of corn or soybeans.

Answer 41

false

Question 42

Why is rice flooded?

Answer 42

weed control

Question 43

______________________________________ is one of the most prevalent and yield robbing weeds of rice.

Answer 43

barnyard grass

Question 44

Which of the following is a common insect pest in rice?

Answer 44

Rice water weevil Rice stink bug Grasshoppers

Question 45

Winter wheat is a competitive crop that tends to suppress dense stands of many weeds.

Answer 45

true

Question 46

What stage of wheat growth is wheat the most tolerant to herbicide applications?

Answer 46

When the length of the leaf sheath exceeds 2" but not more than 4" above the soil surface

Question 47

Which of the following describes problems associated with weeds in forage crops?

Answer 47

Weeds are sometimes lower in protein Weeds are less palatable to livestock Weeds can be poisonous to livestock

Question 48

Which of the following is NOT a good management practice when trying to prevent weeds in forage crops?

Answer 48

Maintain a Low pH

Question 49

Established hay crops such as alfalfa, clovers, and alfalfa grass mixtures tend to be most prone to weed infestations during what time of year?

Answer 49

winter

Question 50

Alfalfa weevil damage tends to begin around early March (southern Missouri) and April (Northern Missouri).

Answer 50

true

Question 51

Potato leafhopper damage in alfalfa tends to happen to which cutting?

Answer 51

2nd and 3rd cutting

Question 52

What is considered the biggest problem with the striped blister beetle in alfalfa.

Answer 52

infested hay is toxic to horses

Question 53

The principal cause of seedling, foliage, and root & crown rot diseases is _________________________________.

Answer 53

fungi

Question 54

_____________________________________ weed species can be particularly troublesome in established orchards due to the lack of soil disturbance which allows their establishment and spread.

Answer 54

Perennial

Question 55

Trees that are maintained in a weed free environment produce more fruit as a result of increased fruit set and size.

Answer 55

true

Question 56

Most diseases of fruit are caused by______________________________

Answer 56

fungi

Question 57

Compared to field crops there are many more herbicides that are labeled for vegetable production.

Answer 57

false

Question 58

There are _____________________ registered herbicides for postemergence weed control in vegetable crops.

Answer 58

few

Question 59

Because vegetables are annual crops and can be tilled several times per season, _______________________________ weeds tend to be the weeds that cause the most problem.

Answer 59

annual

Question 60

Which of the following are problems that weeds cause in tobacco operations?

Answer 60

ower yield and quality Increased production cost Interference with harvesting Increase in the spread of diseases through cultivation Serve as alternate host for for disease organisms