Pirimicarb: A Selective Systemic Insecticide for Aphid Control

Technical Introduction

Pirimicarb (IUPAC name: 2-dimethylamino-5,6-dimethylpyrimidin-4-yl dimethylcarbamate) is a selective carbamate insecticide developed specifically for the control of aphids (Aphididae) on crops. Unlike broad-spectrum carbamates and organophosphates, Pirimicarb is highly specific to aphids, with minimal impact on beneficial insects such as ladybirds, lacewings, hoverflies, and parasitic wasps.

• Mode of Action: Pirimicarb acts as an acetylcholinesterase inhibitor (AChE inhibitor), leading to overstimulation of the nervous system in aphids.

• Systemic & Translaminar Activity: It can penetrate plant tissues and control hidden or underside-feeding aphids.

• Selective Spectrum: Strong against both resistant and non-resistant aphid populations, while sparing beneficial organisms.

Applications

• Field Crops:

  • Wheat, barley, and oats: Control of cereal aphids, preventing yield loss and virus transmission.

  • Cotton: Protection from cotton aphid infestations.

• Horticultural Crops:

  • Potatoes, beans, peas, cucumbers, tomatoes, and peppers: Effective against green peach aphid (Myzus persicae), pea aphid, and potato aphid.

• Fruit Crops:

  • Apples, pears, plums, and citrus: Protection from aphid damage and honeydew secretion.

• Ornamentals & Floriculture:

  • Used in roses, chrysanthemums, and other ornamentals to keep foliage clean and healthy.

Advantages

• Aphid-Specific Control: Targets aphids without significantly harming natural enemies.

• Systemic Action: Protects new plant growth by moving within the vascular system.

• Translaminar Activity: Reaches aphids feeding on the underside of leaves.

• Resistance Management: Effective against many strains of aphids resistant to pyrethroids or organophosphates.

• Environmental Safety: Low toxicity to bees (when used as directed) and beneficial insects.

• Virus Transmission Reduction: By controlling aphids, Pirimicarb indirectly reduces the spread of plant viruses.

Specifications (Typical Parameters)

FAQ

Q1: What makes Pirimicarb different from other carbamate insecticides?
A: Unlike broad-spectrum carbamates, Pirimicarb is aphid-specific, sparing most beneficial insects and reducing secondary pest outbreaks.

Q2: Does Pirimicarb control other pests like whiteflies or thrips?
A: No, it is highly specific to aphids and does not control other insect groups.

Q3: How should Pirimicarb be applied for maximum effectiveness?
A: Apply early in aphid infestations, ensuring good foliar coverage. Its systemic and translaminar properties will protect both upper and lower leaf surfaces.

Q4: Is Pirimicarb safe for bees?
A: Yes, when applied according to label instructions, Pirimicarb has low toxicity to bees, making it pollinator-friendly.

Q5: Can Pirimicarb help manage insecticide resistance?
A: Yes, Pirimicarb is effective against pyrethroid- and organophosphate-resistant aphid strains, making it a valuable rotation tool in resistance management programs.