Iha 2011 August Webinar - Ohp

Explanation
The given answer is true. Fungus gnats, white flies, and mites are indeed the most common pests found on poinsettias. These pests can cause significant damage to the plants by feeding on the leaves, stems, and roots. Fungus gnats are small flying insects that lay their eggs in the soil, while white flies are tiny white insects that suck sap from the plant. Mites are microscopic pests that can cause discoloration and distortion of the leaves. Therefore, it is important to regularly monitor and control these pests to ensure the health and vitality of poinsettias.

Explanation
Fungus Gnats are not identified by the white-ish spots on the back of their wings. This statement is false.

Explanation
Shore flies are not true flies, as they belong to the family Ephydridae which is a type of small fly commonly found near bodies of water. The larvae of shore flies do not have a clear body and notable dark head, therefore the statement is false.

Explanation
The given statement suggests that there are three types of whiteflies commonly found on poinsettia plants: Common, B type, and Q type. The question asks whether this statement is true or false. The correct answer is True, indicating that the statement is accurate.

Explanation
Marathon should be used later in the crop cycle because the roots need to be fully developed in order to effectively absorb the nutrients provided by the pesticide. Using Marathon earlier in the cycle may result in a shorter residual effect and less effective control of pests. Therefore, it is true that Marathon should be used later in the crop cycle for optimal results.

Explanation
The recommended spray for Northern poinsettia growers is 2500 PPM of B-Nine and 1000 PPM of Cycocel.

Explanation
Spraying PGR's after the beginning of short days can risk bract development. Bracts are modified leaves that surround and protect the reproductive structures of certain plants, such as flowers. They are responsible for attracting pollinators and providing support to the flowers. If PGR's are sprayed during this time, it can disrupt the natural development of bracts and affect their functionality. This can result in improper pollination and reduced flower quality. Therefore, it is advisable to avoid spraying PGR's after the beginning of short days to prevent any negative impact on bract development.

Explanation
The explanation for the correct answer is that when the plants are above the poinsettia growth curve, it is recommended to add a dose. This indicates that the plants are growing well and can benefit from additional nutrients or care. On the other hand, if the plants are below the curve, it is advised to hold off on the dose, as they may not require any additional treatment at that stage.

Explanation
Kontos is effective against sucking insects such as whitefly and mites or thrips, with a recommended dosage of 1.7 fl oz per 100. On the other hand, Judo is primarily effective against mites and secondarily against whitefly, with a higher recommended dosage of 4 fl oz per 100. Therefore, the statement is true as it accurately describes the strengths of these two insecticides against specific pests.