CBRC SET B

通報

問題一覧

Why do rodents may develop bait shyness to acute poison?

it causes rapid and lethal effect

In which of the following will you suspect rodent infestation in your field?

All of the above

Rats will produce two or three litters of__pups per cropping season, none of which will breed in that season.

5-10 pups

To distinguish golden apple snails from native snails, what parameters are checked?

color and size

Why do golden apple snails able to attack rice seedlings upto 30DAT?

Due to softer stems of the seedlings at this time

When is the critical time to manage golden apple snails in direct wet seeded rice?

first 21 days after direct wet-seeding

A vertebrate pest which is a perennial problem in crop production that usually demands unified, coordinated, and sustaine community action to gain an effective control

rodents

These organism is introduced to Asia, from South America, in the 1980s as potential food for people, but it unfortunatel became a major pest of rice

Pomacea canaliculata

White heads can also be caused by stemborer, how can you identify that the damage is caused mainly by rice-eating birds?

Not all grains are chaffy

Damage caused by weeds is generally not visible or noticeable because

weeds seldom causes total crop failure

Not all weeds are destructive, some are useful to man in terms of

Providing food and cover for wild life

Weeds can also cause losses in terms of its effect on water management such as:

Active evaporation

Some weed species can cause hazard to human health as well as livestock. This aquatic weed serves as host habitat to mosquitos carrying the parasite responsible for rural filiariasis and encephalomyelitis

Pistia stratiotes

Some weeds are toxic to humans and livestock. This species cause diarrhea resulting to death of animals

Chromolaena odorata

Perennial weeds are also called "evergreens" and reproduce by seeds and vegetative propagules. Water lettuce is an aquatic perennial that reproduce by

Off shoot

Seed dispersal through water run-off is common among weeds because of

Light weight and possess oily film to enable them to float

Allelopathy in weeds-crop associated means

Weeds secreting substances that may stimulate or retard the growth of the associated crop

Seed dormancy is an important adaptive mechanism of weeds because

It permits germination of the weeds after the crop has been established

Which of the following weed species is an example of a monocotyledonous broadleaf?

Monochoria vaginalis

Cyprus rotundus is able to persists because:

All of the above

A grass is a weed, which has

Has a hollow cylindrical culm, distinct nodes and internodes leaves that are arranged alternately and arises from the nodes

Which of the following best describes a weed in relation to crop production:

It is a pest at a particular situation

The following species reproduce asexually EXCEPT

Fimbristylis littoralis

Poisoning specimens for herbarium collection means:

Dipping it in a solution

The tubers of Cyprus rotundus would remain dormant if:

Cyprus rotundus plants are left intact

The physical form of dormancy is brought about by the pressure of

Thick seed coat

The sedges possess the following traits except

Hollow stem

Allelopathic plants are those that secrete substances

All of the above

The critical period of competition is generally about

1/3 to 12 of the crop life cycle

The allelopathic substances produced by plants which are effective against another plant

koline

Weed control activities must be done during this stage to ensure good yield

During the critical period

The predominance of weed species in the field is due to all of the following reasons except:

None of the above

The first sign of germination showing the root breaking into the weed seed is called

root elongation

This weed is vine-like and can quickly spread and compete with sweet potato plants for nutrients and sunlight.

Morning Glory

This involves evaluating the potential invasiveness and impact of weed species before their introduction into new areas

Weed Risk Assessment and Prevention

In this technique, weeds are allowed to emerge for at least 2 weeks before being killed.

Stale seedbed

Which of the following is a cultural control method for weeds?

All of the above

What happens during seed imbibition?

starch hydrolysis

In dry-seeded rice, what is the appropriate step in controlling weeds?

Pre-emergence herbicides should not be applied in standing water

Mandibles are highly developed in what insects?

Beetles

Banana and Abaca Bunchy Top is caused by a virus transmitted by a brown banana aphids known as

Pentalonia nigronervosa

A category of pest cause no significant damage under the conditions currently prevailing, however, this can be a key or occasional pest if conditions in the field are disrupted

potential

When the mouthpart are directed anteriad, this is known as

Prognathous

The insect order characterized by having scales on its membranous wings

Lepidoptera

These insects are omnivores, they feed on thin leafed perennials but also feed on other insects especially pests and commonly used as biocon agents in IPM

Dermaptera

Why are Plecopterans are also known as indicators of water purity?

They survive in clean, well-oxygenated waters

The larvae of the insects in this order are important predators in aquatic ecosystems and they also serve as food for fish and other aquatic vertebrates

Siphonaptera

To limit pest and disease damage, the most appropriate step is

apply pesticide within 40 days of planting

Which of the following is TRUE about mole crickets?

All of the above

Which of the following can favor population build up of rice stemborer?

All of the above

Which of the following suggests rice hispa infestation?

All of the above

These insects are known for their ability to feed on wood and other cellulose-containing materials.

termites

Why are termites known as social insects?

They observe caste system

In which of the following conditions root aphids are NOT favored to thrive?

poor-drained soils

This is the premier research institution in the Philippines dedicated to rice research and development. It conducts research on various aspects of rice production, including crop protection

Philippine Rice Research Institute

Which botanical insecticide acts as a contact and stomach poison for insects?

Rotenone

In true bugs, the__are folded under the__ when at rest

hindwings, forewings

Which of the following is a sensory structure in an insect's mouthpart?

palps

Which of the following is a correct match?

mandibles-beetles

Which of the following botanical insecticide is extracted from the seeds of the neem tree that disrupt insect growth and feeding?

azadirachin

Which of the following modified wing part is described as interlocking with a row of grooves or ridges on the posterior edge of the forewing?

Hemelytron

What is the primary function of halteres in an insect wing?

provide sensory information to the isect about its body position, movement, and orientation during flight

This is a pest that affects various citrus trees. The larvae create winding tunnels within the leaves, leading to distorted and curling foliage

Phyllocnistis citrella

This is an invasive pest that has rapidly spread across many countries, including the Philippines, since its first detection in Africa in 2016. It primarily affects maize (com) crops but can also infest other crops such as rice, sorghum, sugarcane, and vegetables

Spodoptera frugiperda

Odd one out based on the insects' antennae

Dragonflies

The larvae of this moth species feed on corn ears, causing damage to the kernels. They tunnel into the ear, leading to kernel injury and susceptibility to secondary infections

Helicoverpa zea

Cutworms are typically active during the___and hide in the soil during the

day; night

What is secreted by aphids?

Honeydew

A sugarcane farm has been reportedly infested with armyworms. Which of the following findings supports the claim that armyworms have infested the farm?

defoliated sugarcanes

In what part of sugarcane can we observe Sugarcane whitefly infestation?

undersides of sugarcane leaves

It is the largest segment of the thorax and carries the third pair of legs

Metathorax

The Integrated Pest Managementt does NOT encourage

Frequent, non-judicial use of pesticides

insecticide X contains the active ingredient at 300g/liter of the formulated product, what percentage of the product is its active ingredient?

Insecticide Y has 3% active ingredient. Express the concetration of insecticide Y in parts per million

30,000

If 33.3kg Furadan 3G had been used and it has 30g Carbofuran active ingredient/kg product, how many kilograms of Carbofuran was applied?

Chemicals that are usually non toxic to insects by themselves but, when added to another substances makes an insecticide mixture with enhanced toxicity

synergists

Which of the following is the most lethal?

LD50

The relative number of heritable qualities in plants that influence the ultimate degree of damages by the pest

host plant resistance

The pest density at which artificial control measures should be applied to prevent pest population increases ot pest outbreak

ETL

During severe corn borer infestation, Furadan 3G should be applied at 33.3kg.ha. How much of the product is needed for 15,000m2 of corn in case of severe corn borer infestation?

49.95kg

If the only available packaging in a farmer's favorite store is 250ml bottle of Confidor SL 100, how many bottles should the farmer buy if he needs 2.25L?

You wish to apply 300 liters of spray solution per hectare to a 0.5 ha area. The recommended spray concentration of the 45% EC pesticide is 0.04%. The spray volume needed for the treated area is:

150L

Irradiation of fruits with gamma rays falls under what method of disease control?

Physical control

Spraying of plants with a plant defense activator such as salicylic acid and dichloroisonicotinic acid falls under what principle of plant disease control?

Immunization

ElL tells the maximum number of pests the crop could tolerate but it does not tell when to do something about the problem

True

This attribute of modern agriculture can aggravate pest and disease problems

all of the above

In the development of crop protection, this phase is characterized by the use of traditional varieties and natural pest control methods

subsistent

Pesticides can enter the body in a number of different ways. What is the mode of entry when pesticides can enter the body when a person is smoking while spraying?

inhalation

Which of the following is INCORRECT about rodent control?

control in individual field is enough

Which of the following denotes a pesticide as "harmful"?

yellow

The amount and type of protective equipment required for spray operators is determined by the:

All of the above

A herbicide when applied to the foliage and kill only the plant part or plant tissues that are very close to the site of application

Contact herbicide

A name given to pesticides by a recognized authority on pesticides nomenclature is called

common name

A pesticide label which refers to the physical properties of the pesticides is called

Ingredients

The main objectives of pest control which is based on occurrence, probabilities of frequency and intensity, distribution and potential for damage is called

prediction

Which among the following is NOT part of the category of pesticide toxicity?

none of the above

The word "CAUTION" is the signal word for what category of pesticides

The breathing organ of insects is

spiracles

Majority of stored product pests belong to the order

Coleoptera

100

Adults bore through cabbage and legless larvae feed on the soft bud of the coconut resulting on the destruction of the whole crown. Asiatic Palm Weevil is also known as

Rhynchophorus ferrugineus

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