A citrus orchard is where the ant story begins—not an almond block. The available reporting describes Argentine ants tending sap-feeding insects and interfering with the predators that might otherwise suppress them.
That distinction matters for an almond operation. The California report describes a pest-control problem in orchards, but the supplied account does not identify almond trials, almond acreage, or almond-specific damage.
A partnership described in other crops
The mechanism is straightforward: ants collect honeydew from sap-feeding pests, then defend that food source from natural enemies. UC Riverside’s account names mealybugs, scale insects, and psyllids among the insects involved.
The California examples in the reporting center on citrus and vineyards. An account of the coastal spread describes ants protecting pests from parasitoids and predators. That is useful context for biological control, but it is not evidence that the same effect is occurring in almonds.
Keep the almond decision in the block
For California almond growers and PCAs, the practical question is not whether ants can protect crop pests; it is whether that interaction is present in a particular almond block and affecting its pest complex. The cited material does not answer that question.
Before changing a biological-control plan or adding an ant treatment, managers can ask their PCA to document ant activity alongside the pests and natural enemies already being scouted. Without that crop-specific observation, importing a citrus or vineyard response into an almond program would be guesswork.