Select the incorrect statement

Options

A. Dragonflies are useful to get rid of mosquitoes
B. Trichoderma species are effective biocontrol agents of several fungal pathogens
C. The use of biocontrol measures will greatly reduce our dependence on toxic chemicals
D. Nucleopolyhedro virus is excellent candidate for narrow spectrum insecticidal applications

Answer

To solve the question of selecting the incorrect statement, we will analyze each statement provided in the video transcript step by step.

### Step 1: Analyze the first statement
**Statement:** Dragonflies are useful to get rid of mosquitoes.
**Analysis:** This statement is correct. Dragonflies are known predators of mosquitoes and their larvae. They help in controlling mosquito populations.

**Hint:** Consider the ecological role of dragonflies in controlling pests.

### Step 2: Analyze the second statement
**Statement:** Trichoderma species are effective biocontrol agents of several fungal pathogens.
**Analysis:** The statement is misleading due to the phrasing. Trichoderma species are indeed biocontrol agents, but they act against fungal pathogens, not "of" them. The use of "of" implies they are pathogens themselves, which is incorrect. Therefore, this statement is incorrect.

**Hint:** Pay attention to the wording; "against" vs. "of" can change the meaning significantly.

### Step 3: Analyze the third statement
**Statement:** The use of biocontrol measures will greatly reduce our dependence on toxic chemicals.
**Analysis:** This statement is correct. Utilizing biocontrol methods, such as natural predators or biopesticides, can reduce the need for synthetic pesticides and fertilizers, leading to a decrease in toxic chemical usage.

**Hint:** Think about the benefits of sustainable agriculture practices.

### Step 4: Analyze the fourth statement
**Statement:** The nucleopolyhedrovirus is an excellent candidate for narrow spectrum insecticidal applications.
**Analysis:** This statement is also correct. Nucleopolyhedrovirus, a type of baculovirus, is known for its specificity in targeting certain insect pests without harming plants or beneficial organisms.

**Hint:** Consider the specificity of biological control agents and their impact on non-target species.

### Conclusion
After analyzing all four statements, the incorrect statement is the second one regarding Trichoderma species. The correct phrasing should indicate that Trichoderma acts against fungal pathogens rather than being effective "of" them.

**Final Answer:** The incorrect statement is the second one about Trichoderma species.