Preposition: on

• leave: Yellow, red, brown or black pustules on leaves & stems.

• skin: Viral infections normally develop with small vesicles or pustules on the skin as the first signs that are noticed.

Adjective modifier

• small: The pathogen produced numerous small yellow powdery pustules, primarily on the lower surface of the infected leaves ( Fig.

• red: His face is covered with black and red pustules, but only in the mirror.

• white: Sunken, discolored patches of bark form white pustules in summer & red fruiting bodies in winter.

• black: Yellow, red, brown or black pustules on leaves & stems.

• sterile: The pustules are known as sterile pustules as they do not have infection within them.

• rust: The severity of the disease attack had notably increased by mid-August when many plants were covered with rust pustules ( uredinia ).

Converse of object

• raise: Symptoms: Raised, coral-red pustules on dead or dying wood.

• cause: The virus causes ugly pustules to form both on the skin and inside the mouth and throat.