What is the most feared group of weeds based on life-span?

Most obnoxious weed grasses reproduced by underground stem that produce new plants. These underground stem are called ________.

Which of the following is INCORRECT?

Weeds that belong to family Cyperaceae are considered ______

More than 95% of the weeds that infest a crop comes from_______

The duration during the life cycle of a crop when it is most affected by competition by weeds is___

The study of weeds and their control

Chemicals that are used to kill weeds

The inherent property of a herbicide to kill some plants but not other plants

The ability of some plants to survive a herbicide treatment that would normally kill other plants

The innate property of a chemical to produce harm

The risk of likelihood of an adverse effect due to exposure to a harmful chemical

The component of a pesticide which is responsible for its toxic effect

The presidential decree number which created the Fertilizer and Pesticide Authority

The year when FPA was promulgated

The DA Special Order number which embodies the provisions on Integrated Pest Management

The year when the DA Special Order on IPM was signed

Selective herbicides

Which of the following growth stages of weeds are most vulnerable to control measures?

Once a crop is infested with weeds, significant yield reduction

Interspecific weed competition can be describe as___

The following are common bases of classifying weeds except______

Allelopathic plants are best described as those that secretes substances

More than 95% of the weeds that infest crops come from:

A monocot weed is one with :

Ligule is found only in_______

Which of the following depicts allelopathy?

. The word ‘CAUTION’ is the signal word for what category of pesticides?

The essence of the critical period of competition is ____

Weeds that originate from other areas and are introduced to the area where they are found is classified as______

Lowland weeds with their roots attached to the soil but the shoots are aerial/abovewater

Weeds that reproduce mainly through seeds, and grow within a year

Weeds with rounded hollow stems and fibrous root system

Weeds with triangular stems and parallel leaf venation

The following are vegetative propagules except____

Most weed seeds in the soil are found within the_____

This is described as the struggle between two or more plants for a limited resource

The weed density, higher than which significant yield losses will be observed

The world’s worst weed based on distribution

Onion and garlic are easily affected by weeds like Cyperaceae and some Broadleaves. It is most likely due to _________.

When the weed management level applied balance between economic gains and actual costs of weed control practice, it is said to be____

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

The following are physical causes of weed dormancy EXCEPT?

Of the broadleaf weeds of sugarcane, which cling to sugarcane